How to use Limestone in a sentence
Limestone, iron and coal are also found.
The opening was filled with ferns which completely covered the beds of limestone and in places hid the streams.
Gabe paced as Tamer climbed a ladder to tablets stacked at the top of one limestone shelf.
Birmingham, situated in an immensely rich iron, coal and limestone region, is the principal manufacturing centre in the state, and the most important centre for the production and manufacture of iron in the southern states.
The great interest in connexion with a dwarf West African race of elephant is in relation to the fossil pigmy elephants of the limestone fissures and caves of Malta and Cyprus.Advertisement
The limestone forms fine scarps on the southern side of the lake, capped by beds regarded as the Yoredale series.
Thus the scenery of a limestone country depends on the solubility and permeability of the rocks, leading to the typical Karst-formations of caverns, swallowholes and underground stream courses, with the contingent phenomena of dry valleys and natural bridges.
Orihuela is situated in a beautiful and exceedingly fertile huerta, or tract of highly cultivated land, at the foot of a limestone bridge, and on both sides of the river Segura, which divides the city into two parts, Roig and San Augusto, and is spanned by two bridges.
The geological formation includes (like that of Java) three regions - the central volcanic, the southern peninsula of Tertiary limestone, and alluvial plains between the older formations.
A large number of beetles inhabit the deep limestone caves of Europe and North America, while many genera and some whole families are at home nowhere but in ants' nests.Advertisement
I might have got good limestone within a mile or two and burned it myself, if I had cared to do so.
They emerged through a back door into a massive foyer made of white marble and limestone with ancient carvings on the walls and statues positioned throughout.
There are extensive woollen and cotton factories, and, in the neighbourhood, a large limestone quarry.
They are all of limestone formation.
The limestone has yielded Proetus, Chonetes and other fossils, and is believed to be of Carboniferous age.Advertisement
The range is, however, continued through the province now called Calabria, to the southern extremity or toe of Italy, but presents in this part a very much altered character, the broken limestone range which is the true continuation of the chain as far as the neighbourhood of Nicastro and Catanzaro, and keeps close to the west coast, being flanked on the east by a great mass of granitic mountains, rising to about 6000 ft., and covered with vast forests, from which it derives the name of La Sila.
The Crati, which flows from Cosenza northwards, and then turns abruptly eastward to enter the same gulf, is the only stream worthy of notice in the rugged peninsula of Calabria; while the arid limestone hills projecting eastwards to Capo di Leuca do not give rise to anything more than a mere streamlet, from the mouth of the Ofanto to the south-eastern extremity of Italy.
The island of Capri, on the other hand, opposite the southern promontory of the Bay of Naples, is a precipitous limestone rock.
The sides of the hill are rocky, and remarkable for the regular stratification of the limestone, which gives the hill at a distance the appearance of being terraced.
In the British Islands native sulphur is only a mineralogical rarity, but it occurs in the Carboniferous Limestone of Oughterard in Co.Advertisement
As quarried or mined free sulphur is always contaminated with limestone, gypsum, clay, &c.; the principle underlying its extraction from these impurities is one of simple liquation, i.e.
The cathedral is faced with pale grey limestone, easily chiselled, but hardening on exposure.
Another group of islands consists of elevated masses of submarine volcanic deposits, upon some of which coral-reef limestone forms a more or less complete covering; such are Tonumeia and the Nomuka group (Mango, Tonua, Nomuka-iki).
The Vavau group consists entirely of coral limestone, which is occasionally crystalline, and contains stalactitic caves of great beauty.
Their formation is carboniferous limestone.Advertisement
There is less stone carving on the exterior walls, door jambs and pillars of the buildings than on those of the Yucatan Peninsula; this is due to the harder and more uneven character of the limestone.
The principal mineral resource of Vermont is its building and monumental stone, including marble and granite and a small amount of limestone.
The "Marble Arch" cave near Florencecourt, with its emerging river, is a characteristic example of the subterranean waterways in the limestone.
Chalk, from which blanc de Troyes is manufactured, and clay are abundant; and there are peat workings and quarries of building-stone and limestone.
The coal is here confined to the lower division of the system; the Upper Carboniferous (corresponding with the English Coal-Measures) is exclusively marine, consisting chiefly of Fusulina limestone.
In the Urals the marine facies is more fully developed and the fauna shows affinities with that of the Productus limestone of the Central Asian mountain belt.
The chest is of limestone coated with stucco, adorned with life-like paintings of offertory scenes in connexion with the sacred Double Axes of Minoan cult.
It was after the Eocene period that the main part of the elevation of the Himalayas took place, as is shown by the occurrence of nummulitic limestone at a height of 20,000 ft.
A bone bed has also been observed at the base of the Carboniferous limestone series in certain parts of the south-west of England.
Its situation is most picturesque, on the steep left bank of the river Nidd, which here follows a well-wooded valley, hemmed in by limestone cliffs.
Several of the excavations in the limestone, which is extensively quarried, are incorporated in dwelling-houses.
The Cloisters (The Metropolitan Museum, N.Y.) displays the twelfth century limestone bust.
Five well-contrasted types of scenery in Derbyshire are clearly traceable to as many varieties of rock; the bleak dry uplands of the north and east, with deep-cut ravines and swift clear streams, are due to the great mass of Mountain Limestone; round the limestone boundary are the valleys with soft outlines in the Pendleside Shales; these are succeeded by the rugged moorlands, covered with heather and peat, which are due to the Millstone Grit series; eastward lies the Derbyshire Coalfield with its gently moulded grasscovered hills; southward is the more level tract of red Triassic rocks.
The principal structural feature is the broad anticline, its axis running north and south, which has brought up the Carboniferous Limestone; this uplifted region is the southern extremity of the Pennine Range.
The Carboniferous or "Mountain" Limestone is the oldest formation in the county; its thickness is not known, but it is certainly over 2000 ft.; it is well exposed in the numerous narrow gorges cut by the Derwent and its tributaries and by the Dove on the Staffordshire border.
Beds and nodules of chert are abundant in the upper parts of the limestone; at Bakewell it is quarried for use in the Potteries.
At some points the limestone has been dolomitized; near Bonsall it has been converted into a granular silicified rock.
A series of black shales with nodular limestones, the Pendleside series, rests upon the Mountain Limestone on the east, south and north-west; much of the upper course of the Derwent has been cut through these soft beds.
A small patch of Millstone Grit and Limestone occurs in the south of the county about Melbourne and Ticknall.
East of Bolsover, the Coal Measures are covered uncomformably by the Permian breccias and magnesian limestone.
Galena and other lead ores are abundant in veins in the limestone, but they are now only worked on a large scale at Mill Close, near Winster; calamine, zinc blende, barytes, calcite and fluor-spar are common.
Limestone is quarried at Buxton, Millersdale and Matlock for lime, fluxing and chemical purposes.
East of Bolsover, the Coal Measures are covered unconformably by the Permian breccias and magnesian limestone.
Galena and other lead ores are abundant in veins in the limestone, but they are now only worked on a large scale at Mill Close, near Winster; calamine, zinc, blende, barytes, calcite and fluor-spar are common.
Large pits containing deposits of white sand, clay and pebbles are found in the limestone at Longcliff, Newhaven and Carsington.
A feature of the upland districts is the total absence of hedges, and the substitution of limestone walls, put together without any mortar or cement.
Besides lead, gypsum and zinc are raised, to a small extent; and for the quarrying of limestone Derbyshire is one of the principal English counties.
In this vicinity also are various small islands of limestone formation which are attractive summer resorts.
It is deeper and more fertile, however, in the basins of the Great Miami and Little Miami rivers, where there is a liberal mixture of decomposed limestone and where extensive areas with a clay subsoil are covered with alluvial deposits.
The mineral wealth of Ohio consists largely of bituminous coal and petroleum, but the state also ranks high in the production of natural gas, sandstone, limestone, grindstone, lime and gypsum.
Although the state has a great amount of limestone, especially in Erie and Ottawa counties, its dull colour renders it unsuitable for most building purposes.` It is, however, much used as a flux for melting iron and for making quick lime.
The country south of the Drave is occupied by several groups of the southern limestone zone, namely the Carnic Alps, the Julian Alps, the Karawankes and the Steiner Alps.
Thus arose, beside minor streets, the imposing central avenue which, starting from a triumphal arch near the great temple of the Sun, formed the main axis of the city from south-east to north-west for a length of 1240 yards, and at one time consisted of not less than 750 columns of rosy-white limestone, each 55 ft.
Such a rock is typically exemplified by a coarse-grained sandstone or conglomerate, while a limestone may be naturally porous, or, like the Trenton limestone of Ohio and Indiana, rendered so by its conversion into dolomite and the consequent production of cavities due to shrinkage - a change occurring only in the purer limestones.
The closed pressure in the Trenton limestone in Ohio and Indiana is about 200-300 lb.
The gas wells of Pennsylvania indicate about double the pressure of those drilled in the Trenton limestone, 600-800 lb.
Peckham, but others have held that it is of exclusively animal origin, a view supported by such occurrences as those in the orthoceratities of the Trenton limestone, and by the experiments of C. Engler, who obtained a liquid like crude petroleum by the distillation of menhaden (fish) oil.
Ansariya, which presently springs up into a high chain of Jurassic limestone with basaltic intrusions, whose peaks rise to 10,000 ft.
In Palestine a limestone containing Carboniferous fossils is found in the midst of the sandstone series, and here the sandstone is immediately succeeded by limestones with Hippurites and other fossils belonging to the Upper Cretaceous.
Nummulitic limestone (Eocene) overlies the Cretaceous in Philistia, and north of Lebanon Eocene and Miocene deposits cover the greater part of the country.
They are due largely to sinkholes or depressions caused by solution of the limestone of the region.
A peculiar feature of the drainage of the state is the large number of subterranean streams and of springs, always found to a greater or less extent in limestone regions.
About half of the varieties of forest trees in the United States are found, and 1 Almost everywhere limestone is the underlying rock, but siliceous sands, brought out by the Atlantic rivers to the N.E., are carried the whole length of the Florida coast by marine action.
From these structural and palaeontological evidences, geologists suppose that the formation of the cave was carried on simultaneously with the excavation of the valley; that the small streams, flowing down the upper ramifications of the valley, entered the western opening of the cave, and traversing the fissures in the limestone, escaped by the lower openings in the chief valley; and that the rounded pebbles found in the shingle bed were carried in by these streams. It would be only at times of drought that the cave was frequented by animals, a theory which explains the small quantity of animal remains in the shingle.
In the north the plateau is overlain by red and purple unfossiliferous sandstones, capped near its edge by a cherty limestone also unfossiliferous but possibly of Lower Cretaceous age.
The prevailing formations appear to be granites which are veined with white quartz, and underlie old sedimentary brown sandstone and limestone formations.
The district is in part agricultural, but contains limestone quarries, some coal-mines and iron-works.
The material is magnesian limestone.
A very peculiar feature of Cuba is the abundance of caverns in the limestone deposits that underlie much of the island's surface.
Around the coast there is a raised shelf of limestone which was undoubtedly a coral reef.
There is an endless amount of stone, very little of which is hard enough to be good for building material, the greatest part being a soft coralline limestone.
The best buildings in Havana are constructed of a very rich white limestone, soft and readily worked when fresh, but hardening and slightly darkening with age.
The material used is a soft, porous magnesian limestone, which is well adapted to the purpose in view.
A remarkable natural phenomenon is that of the so-called "banana holes," which frequently occur in the limestone.
They descend in parallel ridges of grey Karst limestone, south-westwards to the sea; their last summits reappear in the multitude of rocky islands along the Dalmatian littoral.
Their monotony is varied only by the fruitful river-valleys and poljes, or upland hollows, where the smaller towns and villages are grouped; the districts or cantons thus formed are walled round by a natural rampart of limestone.
Along the west frontier there appear broad and strongly marked zones of Cretaceous limestone, alternating with Jurassic and Triassic, joined by a strip of Palaeozoic formations running from the north-west corner of Bosnia.
Besides huge masses of old schists and sandstones, the range contains extensive limestone, marble, diorite, basalt and porphyry formations, while granite prevails on its southern slopes.
In erratic blocks of sandstone, found on the Disco shore of the Waigat, have been detected a Sigillaria and a species of either Pecopterisor Gleichenia, perhaps of this age; and probably much of the extreme northern coast of Ellesmere Land, and therefore, in all likelihood, the opposite Greenland shore, contains a clearly developed Carboniferous Limestone fauna, identical with that so widely distributed over the North American continent, and referable also to British and Spitsbergen species.
The whole plan is drawn from three centres, the outer portion of the curves being arcs of a larger circle than the one used for the central portion; the complete circle of the orchestra is marked by a sill of white limestone, and greatly enhances the effect of the whole.
In the southern chain is found a limestone formation analogous to that in Bali, Lombok and Java.
Coal and limestone are found near the city.
The best crystallized specimens of any mica are afforded by the small brilliant crystals of biotite, which encrust cavities in the limestone blocks ejected from Monte Somma, Vesuvius.
There are a number of grey and blue limestone quarries, one of which is owned and operated by the municipality.
The native carbonate or cerussite (q.v.) occasionally occurs in the pure form, but more frequently in a state of intimate intermixture with clay ("lead earth," Bleierde), limestone, iron oxides, &c. (as in the ores of Nevada and Colorado), and some times also with coal ("black lead ore").
The Nevada mines are mostly grouped around the city of Eureka, where the ore occurs in "pockets" disseminated at random through limestone.
It forms gigantic deposits of almost constant thickness, embedded between a floor of limestone and a roof of porphyry.
The principal imports are coal, timber and slates, and the principal export stone of the Transition limestone or Devonshire marble.
The central plateau is a plain whose surface presents "rounded, flat-topped hills and low ridges and reefs of limestone," with narrow intervening valleys.
The phosphatic deposit has doubtless been produced by the long-continued action of a thick bed of sea-fowl dung, which converted the carbonate of the underlying limestone into phosphate.
Besides the ordinary shell money, there is a sort of stone coinage, consisting of huge calcite or limestone discs or wheels from 6 in.
The coral limestone of the atoll has a peculiar vitrified appearance and gives out a ringing sound when struck or simply walked on.
There is a lower series consisting of sandstone and an upper series of limestone.
Many of the richer deposits have never been developed because of a lack of fuel and limestone.
Far poorer are the slopes of Parnon, consisting for the most part of barren limestone uplands scantily watered.
There are quarries of limestone in the vicinity.
The greater part of Hungary is well provided with both rivers and springs, but some trachytic and limestone mountainous districts show a marked deficiency in this respect.
The Dolomite Series, known to the Dutch as " Olifants Klip," consists of a bluish-grey magnesian limestone with bands of chert.
In the vicinity are valuable deposits of crinoid limestone, a coarse white building stone which takes a good polish.
The Lower Cretaceous consists chiefly of sandstones and shales and the Middle Cretaceous of very fossiliferous limestone.
The material (limestone) was quarried on the spot.
The south wall of Epipolae, considerable remains of which exist, shows traces of different periods in its construction, and was probably often restored.2 It is built of rectangular blocks of limestone generally quarried on the spot, about 53 ft.
Marcianus, and the type is different from that of the Roman catacombs, the galleries being far larger (partly owing to the hardness of the limestone in which they are excavated), and having circular chambers at the points * of junction.
Its upheaval above the great sea which submerged all the north-west of the Indian peninsula long after the Himalaya had massed itself as a formidable mountain chain, belongs to a comparatively recent geologic period, and the same thrust upwards of vast masses of cretaceous limestone has disturbed the overlying recent beds of shale and clays with very similar results to those which have left so marked an impress on the Baluch frontier.
They build up natural aqueducts of limestone, and after flowing for a time on these elevated beds burst their walls and take a new course.
For the highest quality of bottles, which are practically colourless, sand, limestone and sulphate and carbonate of soda are used.
This variety must certainly be magnesian limestone.
Magnesian limestone mixed and fused with sand and an alkaline carbonate produces a permanent glass.
This vast flat, the modern El-Jezireh, is about 250 miles in length, interrupted only by a single limestone range, rising abruptly out of the plain, and branching off from the Zagros mountains under the names of Sarazur, Hamrin and Sinjar.
North of the plateau rises a well-watered and undulating belt of country, into which run low ranges of limestone hills, sometimes arid, sometimes covered with dwarf-oak, and often shutting in, between their northern and north-eastern flank and the main mountain-line from which they detach themselves, rich plains and fertile valleys.
The carbonic acid gas injected into the highly limed juice in the saturators is made by the calcination of limestone in a kiln provided with three cleaning doors, so arranged as to allow the lime to be removed simultaneously from them every six hours.
Remains of the city walls, with traces of one gate and several towers, of a total length of over 3 m., still exist, and belong to three different periods, in all of which the crystalline limestone of the locality is used.
In certain sandy soils and in a few stiff clays it may amount to less than 4%, while in others in limestone and chalk districts there may be 50 to 80% present.
The deposits in the great limestone caves of Kentucky, Virginia and Indiana have been probably derived from the overlying soil and accumulated by percolating water; they are of no commercial value.
The Bala limestone is from 20 to 40 ft.
The series in the type area consists of the Hirnant limestone, a thin inconstant bed, which is separated by 1400 ft.
The Coral Limestone series lies indifferently upon the older beds.
On the west they rise somewhat steeply, exposing high cliffs of white limestone, which perhaps gave Palgrave the impression that the range is of greater absolute height than is actually the case.
Upon the sandstone rest a few scattered outliers of limestone, probably of Cretaceous age, the largest of which occur near Jauf and east of Bureda.
These inscriptions are generally on limestone or marble or on tablets of bronze, and vary from a few inches to some feet in length and height.
The furnace used by Henri Moissan in his experiments on reactions at high temperatures, on the fusion and volatilization of refractory materials, and on the formation of carbides, suicides and borides of various metals, consisted, in its simplest form, of two superposed blocks of lime or of limestone with a central cavity cut in the lower block, and with a corresponding but much shallower inverted cavity in the upper block, which thus formed the lid of the furnace.
The "lion-coloured" coat approximates to the hue of the limestone rocks on which these sheep dwell.
The principal formation is coralline limestone; the eastern coast is defended by coral reefs, and the neighbouring sea (extending as far as New Guinea, and thus demonstrating a physical connexion with that land) is shallow, and abounds in coral in full growth.
The surrounding country is well adapted to agriculture, and slate, iron ore, cement rock and limestone are found in the vicinity.
Taking magnesia alba, which he distinguished from limestone with which it had previously been confused, he showed that on being heated it lost weight owing to the escape of this fixed air (named carbonic acid by Lavoisier in 1781), and that the weight was regained when the calcined product was made to reabsorb the fixed air with which it had parted.
On the other hand, limestone and sandstone, especially of the Mesozoic strata, are strikingly deficient.
It is in a picturesque farming country, and there are good limestone quarries in the valley of the Des Plaines river.
Between this lowland and Armagh city, the early Cainozoic basalts form slightly higher ground, while on the west a strip of Trias appears, overlying Carboniferous Limestone.
The Carboniferous Limestone beneath it and around it is red-brown instead of grey, and is famous for its richness in fish remains.
Towards Charlemont there is much reclaimable bog resting on a limestone substratum.
Along the western side of northern Anti-Lebanon stretches the Khasha'a, a rough red region lined with juniper trees, a succession of the hardest limestone crests and ridges, bristling with bare rock and crag that shelter tufts of vegetation, and are divided by a succession of grassy ravines.
These sculptures, which are in rough limestone, most likely belong to the earlier building, as their surface is in a better state of preservation than could be possible if they had been long exposed to the air.
Ennis has breweries, distilleries and extensive flour-mills; and in the neighbourhood limestone is quarried.
On the site of the old court-house a colossal statue in white limestone of Daniel O'Connell was erected in 1865.
The soil, though thin, is, as in other limestone islands, very rich, and coco-nuts, tara, yams and bananas thrive.
The town is built of white Oamaru limestone.
The district is famed for its stock, and the fine quality of its grain; also for the character of the English grasses laid down there, which flourish in a rich black loam on a limestone formation.
The Klippen are isolated hills, chiefly of Jurassic limestone, rising up in the midst of the later and softer deposits on the inner border of the sandstone zone.
The limestone pavement, with long porches on either side, was found to stop at the foot of a marble staircase of thirty-four steps of Byzantine construction, underneath which appeared a Roman arrangement of the two flights with a platform halfway up. The top flight led up to the propylaea.
This Pirene originally had a two-storey facade of Roman fashion made of limestone, but, before the time of Pausanias, it had received a covering of marble which has now fallen off, but has left traces of itself in the holes drilled into the limestone, in the rough hacking away of the half columns, and in the numerous marble fragments which lay in front of the facade.
The Maltese Islands consist largely of Tertiary Limestone, with somewhat variable beds of Crystalline Sandstone, Greensand and Marl or Blue Clay.
The Lower Limestone probably belongs to the Tongarian stage of the Oligocene series, and the Upper Coralline Limestone to the Tortonian stage of the Miocene.
A closer investigation of the numerous long, narrow banks which lie off the Flemish coast and the Thames estuary shows that they are composed of fragments of rock abraded and transported by tidal currents and storms in the same way that the chalk and limestone worn off from the eastern continuation of the island of Heligoland during the last two centuries has been reduced to the coarse gravel of the off-lying Dune.
Jacobs Cavern is one of the smaller caves, hardly more than a rock-shelter, and is entirely in the "St Joe Limestone" of the sub-carboniferous age.
Its roof is a single flat stratum of limestone; its walls are well marked by lines of stratification; dripstone also partly covers the walls, fills a deep fissure at the end of the cave, and spreads over the floor, where it mingles with an ancient bed of ashes, forming an ash-breccia (mostly firm and solid) that encloses fragments of sandstone, flint spalls, flint implements, charcoal and bones.
It holds scattered fragments of limestone, and is itself the result of limestone degeneration.
The commencement of the Carboniferous period is marked by a mass of limestones known as the Carboniferous or Sequences Mountain Limestone,which contains a large assemblage of carbon- of marine fossils, and has a maximum thickness in iferous S.W.
These are also called the Upper Limestone Shale, a similar group being found in places below the limestone, and called the Lower Limestone Shale, or, in the north of England, the Tuedian group. Going northward the beds of limestone diminish in thickness, with a proportional increase in the intercalated sandstones and shales, until in Scotland they are entirely subordinate to a mass of coal-bearing strata, which forms the most productive members of the Scotch coalfields.
The latter member is marked by a thin limestone band near the top, containing Spirorbis carbonarius, a small marine univalve.
The actual coal measure strata, consisting mainly of shales and clays, are generally impervious to water, but when strata of a permeable character are sunk through, such as the magnesian limestone of the north of England, the Permian sandstones of the central counties, or the chalk and greensand in the north of France and Westphalia, special methods are required in order to pass the water-bearing beds, and to protect the shaft and workings from the influx of water subsequently.
Some of the earlier sinkings of this kind, when pumps had to be depended on for keeping down the water, were conducted at great cost, as, for instance, at South Hetton, and more recently Ryhope, near Sunderland, through the magnesian limestone of Durham.
The eastern part of the Prairie Plains is a belt known as the Black Prairie, and it has a rich black soil derived from Upper Cretaceous limestone; immediately west of this is another belt with a thinner soil derived from Lower Cretaceous rocks; a southern part of the same plains has a soil derived from granite; in a large area in the north-west the plains have a reddish clay soil derived from Permian rocks and a variety of soils - good black soils and inferior sandy and clay soils - derived from Carboniferous rocks.
Limestones and sandstone are also profitably quarried, the value of the product in 1908 being $530,945 for limestone and $2337 for sandstone.
In formation it resembles the limestone Alps of Tirol and there are on its elevated plateaus a number of doline or funnel-shaped depressions into which the melted snow and the rain sink.
From Cape Buru westwards precipitous limestone cliffs, several hundred feet high, face the sea and rise into forest-clad mountains behind.
Some iron ore, gypsum, salt and limestone are also produced.
Many waterfalls descend the hill-sides, the best known being the Reichenbach and the Alpbach, while the great gorge pierced by the Aar through the limestone barrier of the Kirchet is remarkable.
Other minerals are emery, limestone and quartz.
The Nahuatl lapidaries had at hand many varieties of workable and beautiful stone - onyx, marble, limestone, quartz and quartz crystal, granite, syenite, basalt, trachyte, rhyolite, diorite and obsidian, the best of material prepared for them by nature; while the Mayas had only limestone, and hard, tenacious rock with which to work it, and timber for burning lime.
They are ridges of aeolian limestone plastered over by a thin layer of corals and other calcareous organisms. The very remarkable "serpuline atolls" are covered by a solid crust made of the convoluted tubes of serpulae and Vermetus, together with barnacles, mussels, nullipores, corallines and some true incrusting corals.
Soil, Climate, &c. - The surface soil is a curious kind of red earth, which is also found in ochre-like strata throughout the limestone.
The district is rich in limestone, coal, ironstone, shale and fireclay, all of which are worked.
Many of the oceanic islets are composed of coral limestone, which in this way becomes phosphatized; others are igneous, consisting of trachyte or basalt, and these rocks are also phosphatized on their surfaces but are not so valuable, inasmuch as the presence of iron or alumina in any quantity renders them unsuited for the preppration of artificial manures.
The deposits near Caylus and in Quercy occupy fissures and pockets in Jurassic limestone, and have yielded a remarkable assemblage of the relics of Tertiary mammals and other fossils.
Bands of black nodules, highly phosphatic, are found at the top of the Bala limestone in North Wales; beds of concretions occur in the Jurassic series; and important deposits are known in the Cretaceous strata, especially in the Lower Greensand and at the base of the Gault.
The steeply rising face of the plateau here is due to the resistance of a durable layer of limestone, known as the Helderberg limestone.
Of these the most notable is the Niagara escarpment which extends eastward from Canada, past Lewiston and Lockport, - a downward step from the Erie to the Ontario plain, where the Niagara limestone outcrops, and its resistance to denudation accounts for the steeply rising face at the boundary between the two plains.
The most pronounced of these upfolded strata in New York form the low Shawangunk mountains, which descend, toward the S.E., to a lowland region of folded strata of limestone, slate and other rocks in Orange and Dutchess counties.
Near Gouverneur, St Lawrence county, is a large quarry of coarsely crystalline magnesian limestone, used as monumental marble.
From an extensive deposit of blue-black magnesian limestone at Glens Falls are taken the choicest varieties of black marble quarried in the United States.
Limestone and clay suitable for making Portland cement are also found in Ulster county and elsewhere, and the production of this increased from 65,000 Barrels in 1890 to 2,290,955 barrels in 1908.
The first oil well in the state was drilled at Limestone in Cattaraugus county in 1865, and the state's output of oil was 1,160,128 barrels, valued at $2,071,533 in 1908.
Cretaceous coals have long been worked in the North Island, north of Auckland, on the shores of the Bay of Islands, where the age of the coal is shown by its occurrence under the Whangarei or Waimio limestone.
In the neighbourhood of Glens Falls are valuable quarries of black marble and limestone, and lime, plaster and Portland cement works.
Limestone is abundant, and the city has various manufactures, including lime, foundry and machine-shop products, agricultural implements, planing-mill products, engines, steam shovels, dredges, pianos and silks.
Limestone also is found most plentifully in the north and north-western parts of the state.
The island consists in the main of limestone, and its elevation above the sea is geologically recent.
Limestone, brownstone and brick-clay also abound in the vicinity; and besides mines and quarries, the city has extensive manufactories of iron, steel, chains, and nuts and bolts.
Granite, sandstone and limestone are abundant in the state, but have been little developed.
Limestone quarried in the same year was worth $124,690; and sandstone was valued at $39,216.
In Mosul, as in Bagdad, only part of the space within the walls is covered with buildings and the rest is occupied by cemeteries; even the solid limestone walls of the ancient town are half in ruins, being serviceable only in the direction of the river, where they check inundations.
On the mountain above it (2073 ft.) are the fine remains of the fortifications of a city built in a very primitive style, in cyclopean blocks of local limestone; within the walls are traces of buildings, and a massive terrace which supported some edifice of importance.
Upon this limestone plateau there is a central area of high ridges, among them the rough crags of Harney, Custer and Dodge peaks.
From Saalberg the Saale enters the dreary limestone formation of Thuringia, sweeps beneath the barren, conical hills lying opposite to the university town of Jena, passes the pleasant watering-place of Kosen, washes numerous vine-clad hills and, after receiving at Naumburg the deep and navigable Unstrut, flows past Weissenfels, Merseburg, Halle, Bernburg and Kalbe, and joins the Elbe just above Barby, after traversing a distance of 226 m.
No ruins are visible, the mounds of the old city being for the most part hidden under modern buildings; but the slopes of the limestone hills behind it are pierced with an infinity of rock-cut tombs, some of which were large and decorated with sculptures, paintings and long inscriptions.
Near Luang Prabang, just beyond the border, in French territory, limestones with Productus and Schwagerina, like the Productus limestone of the Indian Salt Range, have been found; also red clays and grauwacke with plants similar to those of the Raniganj beds; and violet clays with Dicynodon, supposed to be the equivalents of the Panche series of India.
A rocky limestone plateau, rising in the east to a height of 675 ft., occupies the centre of the island, and from it the land descends in a series of well-wooded terraces to the sea.
Calcium carbonate, CaCO 3, is of exceptionally wide distribution in both the mineral and animal kingdoms. It constitutes the bulk of the chalk deposits and limestone rocks; it forms over one-half of the mineral dolomite and the rock magnesium limestone; it occurs also as the dimorphous minerals aragonite (q.v.) and calcite (q.v.).
Calcium nitrate, Ca(N0,)2.4H20, is a highly deliquescent salt, crystallizing in monoclinic prisms, and occurring in various natural waters, as an efflorescence in limestone caverns, and in the neighbourhood of decaying nitrogenous organic matter.
Manganese could be readily worked in Timor, where it lies in the Carboniferous Limestone.
The Senonian series is represented by the White Limestone, a hardened chalk with flints, which is often glauconitic and conglomeratic at the base.
At the foot of the grey limestone mass of Mount Mitzekeli (1500 ft.), which forms part of the fine range of hills running north from the Gulf of Arta, there lies a valley (the Hellopia of antiquity) partly occupied by a lake; and the city is built on the slopes of a slight eminence, stretching down to the western shore.
Buildings, &c. - Brick, blue limestone, and a greyish buff freestone are the most common building materials, and the city has various buildings of much architectural merit.
The Miocene included a limestone with Clypeaster.
One of the best known of these is the Stonesfield slate, which is a Jurassic limestone occurring near Oxford and famous for its fossils.
There is a large limestone quarry within the borough limits.
Its principal streams are those that cross the West Shore of the Coastal Plain and here wind their way from Parr's Ridge rapidly toward the south-east in narrow steep-sided gorges through broad limestone valleys.
West of Parr's Ridge in the Piedmont, the principal soils are those the character of which is determined either by decomposed red sandstone or by decomposed limestone.
The Allegheny ridges have only a thin stony soil; but good limestone, sandstone, shale and alluvial soils, occur in the valleys and in some of the plateaus of the extreme west.
The Maryland building stone, of which there is an abundance of good quality, consists chiefly of granites, limestones, slate, marble and sandstones, the greater part of which is quarried in the east section of the Piedmont Plateau especially in Cecil county, though some limestones, including those from which hydraulic cement is manufactured, and some sandstones are obtained from the western part of the Piedmont Plateau and the east section of the Appalachian region; the value of stone quarried in the state in 1907 was $1,439,355, of which $1,183,753 was the value of granite, $142,825 that of limestone, $98,918 that of marble, and $13,859 that of sandstone.
It is a constituent of the minerals cerussite, malachite, azurite, spathic iron ore, calamine, strontianite, witherite, calcite aragonite, limestone, &c. It may be prepared by burning carbon in excess of air or oxygen, by the direct decomposition of many carbonates by heat, and by the decomposition of carbonates with mineral acids, M2C03+2HC1=2MCl-FH 2 O+CO 2.
Their waters unite in one stream whose course is marked by gigantic limestone cones, some of which are 36 ft.
To the Pliocene period the marine deposits of the Sahel of Algiers and of the Sahel Jijelli must be attributed; also the lacustrine marls and limestone of the basin of Constantine, and the ancient alluviums of the basins and depressions which bear no relation to the existing valleys.
Ghardaia, which is divided by walls into three quarters, is built of limestone and the houses are in terraces one above the other.
The town consists of three portions - the citadel on a limestone hill, the upper and the lower town - separated by irregular plantations of date trees.
The best soils are the alluvium in the bottom-lands along some of the larger rivers and that of the Blue Grass Region, which is derived from a limestone rich in organic matter (containing phosphorus) and rapidly decomposing.
Jefferson, Jessamine, Warren, Grayson and Caldwell counties have valuable quarries of an excellent light-coloured Oolitic limestone, resembling the Bedford limestone of Indiana, and best known under the name of the finest variety, the " Bowling Green stone " of Warren county; and sandstones good for structural purposes are found in both coal regions, and especially in Rowan county.
In 1907 the total value of limestone quarried in the state was $891,500, and of all stone, $1,002,450.
The main road from Durham to Sunderland here passes through a remarkable cutting in the limestone 80 ft.
The population is mainly dependent on the neighbouring collieries, but limestone quarrying is carried on to some extent.
Scranton better grades of iron ore and of limestone were procured, and within a decade a rolling mill, a nail factory and a manufactory of steel rails were established, and adequate facilities for railway transportation were provided.
The geological formation is principally of volcanic rocks, with schists and tertiary limestone; and an early physical connexion of the islands with New Zealand is indicated by their geology and biology.
The borough has a large trade with the surrounding country, which is well adapted to agriculture and abounds in limestone.
In the lead-mining districts of Derbyshire and the north of England the ore occurs as veins and flats in the Carboniferous Limestone series, whilst in Cornwall the veins traverse clay-slates.
In the Upper Mississippi lead region of Missouri, Illinois, Iowa and Wisconsin the ore fills large cavities or chambers in limestone.
Dublin lies on the great central limestone district which stretches across the island from the Irish Sea to the Atlantic Ocean, and occupies both banks of the river Liffey.
But certainly an Etruscan city was situated on the hill of Colonna, where there are remains of city walls of massive limestone, in almost horizontal courses.
Copper and Mende are found, and there are limestone quarries.
Again, in Kentucky and Tennessee, there is a double alternation of sandstone and limestone in the plateau-making strata; and as the skyline of the plateau bevels across these formations, there are west-facing escarpments, made ragged by mature dissection, as one passes from the topographically strong sandstone to the topographically weak limestone.
The chief upland belt or cuesta is formed by the firm Niagara limestone, which takes its name from the gorge and falls cut through the upland by the Niagara river.
The cuesta begins where its determining limcstone begins, in west-central New York; there it separates the lowlands that contain the basins of lakes Ontario and Erie; thence it curves to the north-west through the province of Ontario to the belt of islands that divide1 Georgian Bay from Lake Huron; then westward throtigh the land-arm between lakes Superior and Michigan, and south-westward into the narrow points that divide Green Bay from Lake Michigan, and at last westward to fade away again with the thinning out of the limestone; it is hardly traceable across the Mississippi river.
When the two lowlands are traced eastward they become confluent after the Niagara limestone has faded away in central New York, and the single lowland is continued under the name of Mohawk Valley, an east-west longitudinal depression that has been eroded on a belt of relatively weak strata between the resistant crystalline rocks of the Adirondacks on the north and the northern escarpment of the Appalachian plateau (Catskills-Helderbergs) on the south; forming a pathway of great historic and economic importance between the Atlantic seaports and the interior.
The northern part of the peninsula is composed largely of a weak limestone; here much of the lowland drainage is underground, forming many sink-holes (swallOwholes).
The basal formation if chiefly a weak limestone, which has been stripped from its original Alabama.
An important geological characteristic of most of the Cordilferan region is that the Carboniferous strata, which in western Europe and the eastern United States contain many coal seams, are represented in the western United States by a marine limestone; and that the important unconformity which in Europe and the eastern United States separates the Palaeozoic and Mesozoic eras does not occur in the western United States, where the formations over a great area follow in conformable sequence from early Palaeozoic through the Mesozoic.
Flanking strata are even better exhibited in the Bighorn Mountains, the front range of northern Wyoming, crescentic in outline and convex to the northeast, like the Laramie Range, but much higher; here heavy sheets of limestone arch far up towards the range crest, and are deeply notched where consequent streams have cut down their gorges.
The results of the first cycle of erosion are seen in the widespread exposure of the resistant Carboniferous limestone as a broad platform in the south-western area of greater uplift through central Arizona, where the higher formations were worn away; and in the development of a series of huge, south-facing, retreating escarpments of irregular outline on the edges of the higher formations farther north.
A group of large volcanoes occurs on the limestone platform s6uth of the Grand Canyon, culminating in Mt San Francisco (12,794 ft.), a moderately dissected cone, and associated with many more recent smaller cones and freshlooking lava flows.
The meta-sedimentary rocks of the Archean include metamorphosed limestone, and schists which carry carbonaceous matter in the form of graphite.
The carbon-bearing shales, slates and schists, and the limestone, are indications that life was relatively abundant, even though but few fossils are preserved.
The middle portion contains much limestone, generally known as the Niagara limestone, and is mtich more widespread than the lower, being found very generally over the eastern interior, as far west as the Mississippi and in places somewhat beyond.
The Niagara limestone contains the oldest known coral reefs of the continent.
They occur in eastern Wisconsin and at other points farther east and south, It is over this limestone that the Niagara falls in the world-famous cataract.
The formations most widely recognized are the Helderberg limestone, the Onondaga limestone and the Hamilton shale.
Here clastic rocks predominate, while limestone is more abundant in the interior, If the maximum thicknesses of all Devonian formations be added together, the total for the system is as much as 15,000 ft.; but such a thickness is not found in any one pluce.
In the Mississippi Basin the larger part of the system is of limestone, though there is some clastic mateiial in both its basal and its upper parts.
The zinc and lead of the Joplin district of Missouri are in the limestone of this system, and the corresponding limestone in some parts of Colorado, as at Leadville, is one of the horizons of rich ore.
In the eastern half of the country the system consists of shales and sandstones chiefly, btit there is some limestone, and coal enough to be of great importance economically, though it makes but a small part of the system quantitatively.
In Texas, whence the name Comanchean comes, and where different parts of the system are of diverse origins, there is some limestone.
In the eastern Gulf states there is more calcareous material, represented by limestone or chalk, In the Texan region and farther north the limestone becomes still more important.
The Colorado series contains much limestone, some of which is in the form of chalk.
Greenbrier limestone 350 400
Lewiston limestone 5501050 ft.
Delaware limestone 30 40
Cedar Valley limestone 250 300 ft.
Anamosa limestone 50 75 ft.
Wapanucka limestone 100 150
Weber limestone 100 550 ft.
Leaciville limestone 400 525 ft.
Yule limestone 350 450 ft.
Limestone is by far the largest element, and with granite makes up two-thirds of the total value.
Many indications of ice action are found in these islands; striated surfaces are to be seen on the cliffs in Eday and Westray, in Kirkwall Bay and on Stennie Hill in Eday; boulder clay, with marine shells, and with many boulders of rocks foreign to the islands (chalk, oolitic limestone, flint, &c.), which must have been brought up from the region of Moray Firth, rests upon the old strata in many places.
This is a limestone belt with parallel hard rock ridges left standing by erosion to form mountains.
It receives its name from its soil (weathered from the weak underlying limestone), which is black in colour, almost destitute of sand and loam, and rich in limestone and marl formations, especially adapted to the production of cotton; hence the region is also called the "Cotton Belt."
In the Cumberland Plateau and Great Valley Regions are a red or brown loam, rich in decomposed limestone and calcareous shales, and sandy or gravelly loaTns.
The soft limestone underlying this region is covered, in the uplands, with grey, sandy soils, which have a subsoil of loam; in the lowlands the surface soils are loams, the subsoils clays.
The locality is also celebrated for the extensive system of caves in the limestone rocks found in its vicinity, which were described by Humboldt in his Personal Narrative.
It is also found associated with limestone, as in the Mammoth Caves, Kentucky, and with gypsum, as atMontmartre.
The surface soil is clay in which are embedded fragments of siliceous sandstone, used for millstones and constructional purposes; the subsoil is limestone.
Geologically and structurally Cyrenaica is a mass of Miocene limestone tilted up steeply from the Mediterranean and falling inland by a gentle descent to sea-level again at the line of depression, which runs from the gulf of Sidra through Aujila to Siwa.
All the large and some of the small islands appear to be composed of ancient volcanic rock, with an incrustation of coral limestone showing here and there along the coast.
The town is built on high ground underlain by solid limestone, and has much natural and architectural beauty.
These beds, with intercalated lavas, form the mountainous west shore of Lough Mask, the east, like that of Lough Corrib, being formed of low Carboniferous Limestone ground.
In some places along the coast there is a narrow strip of decomposed coral limestone; often, too, a coral reef has served to catch the sediment washed down the mountain side until a deep sedimentary soil has been deposited.
The whole island, composed as it is of various limestone formations, presents great diversity of surface, and the prospects from the more elevated spots are magnificent.
They were closed when the property was bought in 1896 by the Louisville & Nashville railway and a new approach made as indicated on the accompanying map. From the surface to the floor is 240 ft.; under Chester Sandstone and in the St Louis Limestone.
Nummulitic limestone occurs in the south-east.
A ridge of limestone hills - whose principal summits, Hagios Elias and Hagios Simeon, are crowned by old Byzantine churches - runs through the island; for about 2 m.
In Bucks and Montgomery counties is a large sandstone area; traversing Chester county is the narrow Chester Valley with a limestone bottom, and in Lancaster county is the most extensive limestone plain.
The north-west part of it is a slate belt that has been much dissected by eroding streams, but the south-east part is a gently rolling belt of limestone to which occasionally a steep hill descends from the slate belt.
The most productive soil is that in the south-east section of the Great Valley and in Chester Valley where it is derived largely from limestone.
There is some of the same formation as well as that derived from red shales on the sandstone hills in the south-east province and in many of the middle and western valleys, but often a belt of inferior slate soil adjoins a limestone belt, and many of the ridges are covered with a still more sterile soil derived from white and grey sandstones.
Pennsylvania has extensive areas of limestone rock suitable for making cement, and in Northampton and Lehigh counties enormous quantities of it are used in this industry.
There are limestone quarries in nearly two-thirds of the counties and great quantities of the stone are used for flux in the iron furnaces, for making quicklime, for railway ballast and for road making.
Volcanic rocks are also present but they are not so extensively developed as in the islands of the Javan arc. The Permian beds consist chiefly of limestone and contain numerous fossils similar to those of the middle and upper divisions of the Productus limestone of northern India and the Artinsk stage of the Urals.
But all routes are difficult, winding between granite and limestone rocks, and abounding in narrow defiles and rugged torrent beds.
Finally our watershed turns south and ends near the great limestone plateau of the Birnbaumerwald, between Laibach and Gorz.
The Trias of the Eastern Alps, on the other hand, consists chiefly of great masses of limestone with an abundant fauna, and is clearly of marine origin.
They consist largely of limestone; but marls and sandstones are by no means rare, and there are considerable gaps in the succession indicating that the region was not continuously beneath the sea.
Considerable portions of the southern wall of the ancient citadel, built in very massive Cyclopean masonry of blocks of limestone, are still to be seen; and the two walls, also polygonal, which formerly united the citadel with the town, can still be traced.
The Beauce is a treeless, arid and monotonous plain of limestone formation; windmills and church spires are the only prominent features of the landscape.
A similar action probably explains the origin of pyrites and marcasite in coal and lignite, in clay and shales, and in limestone like chalk.
The Coal-Measures and Millstone Grit are usually grouped together in the Upper Carboniferous, the Carboniferous Limestone series constituting the Lower Carboniferous.
The fossil plants connect this group with the coal-measures; the marine fossils have, to some extent, a Carboniferous limestone aspect.
The thick, main or scaur limestone (mountain limestone) of the centre and south of England, Wales and Carboniferous Ireland, which splits up in the Yorkshire dales C Limestone (Yoredale group) into a succession of stout limestone Li Series.
In Britain the Carboniferous limestone series is 2000-3500 ft.
Each of these groups contributed at one place or another towards the upbuilding of great masses of limestone.
In North America, the crustal movements at the beginning of the period are less evident than in Europe, but a marked parallelism exists; for in the east, in the Appalachian tract, we find detrital sediments prevailing, while the open sea, with great deposits of limestone, lay out towards the west in the direction of that similar open sea which lay towards the east of Europe and extended through Asia.
In the Carboniferous Limestone series, the purer kinds of limestone are used for the manufacture of lime, bleaching powder and similar products, also as a flux in the smelting of iron; some of the less pure varieties are used in making cement.
Unlike the northern, the southern affluents of the Ombilin do not follow longitudinal valleys hemmed in by the Barisan range and ranges of slate, limestone and sandstone.
It lies unconformably upon the older rocks; and the limestone contains Fusulina, Phillipsia and Productus, indicating that it belongs to the Upper Carboniferous.
The Miocene consists chiefly of marls, with occasional beds of lignite and limestone.
Bats of some twenty-five species have been registered; in central Sumatra they dwell in thousands in the limestone caves.
Interpenetrating this descending column of solid ore, limestone and coke, there is an upward rushing column of hot gases, the atmospheric nitrogen of the blast from the tuyeres, and the FIG.
The duty of the limestone (CaCO 3) is to furnish enough lime to form with the gangue of the ore and the ash of the fuel a lime silicate or slag of such a composition (1) that it will melt at the temperature which it reaches at about level A, of fig.
Below this level the solid charge descends easily, because it consists of coke alone or nearly alone, and this in turn because the temperature here is so high as to melt not only the iron now deoxidized and brought to the metallic state, but also the gangue of the ore and the limestone, which here unite to form the molten slag, and run freely down between the lumps of coke.
There are some very evident disadvantages of excessive height; for instance, that the weight of an excessively high column of solid coke, ore and limestone tends to crush the coke and jam the charge in the lower and narrowing part of the furnace, and that the frictional resistance of a long column calls for a greater consumption of power for driving the blast up through it.
This lime is charged in the form of common quicklime, CaO, resulting from the calcination of a pure limestone, CaCO 3, which should be as free as possible from silica.
Several of the Latin cities, including Tibur and Praeneste, were situated on the terrace-like underfalls of these mountains, 2 while Cora, Norba and Setia were placed in like manner on the slopes of the Volscian mountains (Monti Lepini), a rugged and lofty limestone range, which runs parallel to the main mass of the Apennines, being separated from them, however, by the valley of the Trerus (Sacco), and forms a continuous barrier from there to Terra.cina.
The forests of the Alban hills and near the coast produce much charcoal and light timber, while the Sabine and Volscian hills have been largely deforested and are now bare limestone rocks.
Limestone appears in various places, and in the north-east a light grey marble is quarried for lime.
On the north-east face of the hill forty steps, cut out of solid limestone, lead upward to a small, dome-roofed recess, which contains some interesting Persian inscriptions cut in relief on the rock, recording particulars of the history of Kandahar, and defining the vast extent of the kingdom of the emperor Baber.
The principal public edifices, however, are constructed of limestone from Oland, including the cathedral, built by Nicodemus Tessin and his son Nicodemus in the second half of the 17th century.
Between the Lot and the Aveyron is a belt of causses or monotonous limestone table-lands, broken here and there by profound and beautiful gorges - a type of scenery characteristic of Aveyron.
No good building stone was at hand; and the public as well as private edifices were constructed either of volcanic tufa, or lava, or Sarno limestone, or brick (the latter only used for the corners of walls).
In a few instances only do we find them making use of a whitish limestone wrongly called travertine, which, though inferior to the similar material so largely employed at Rome, was better adapted than the ordinary tufa for purposes where great solidity was required.
That of the Doric temple in the Foro Triangolare (6th century B.C.) and an old column built into a house in Region vi., Insula 5; also of the older parts of the city walls - date uncertain (Sarno limestone and grey tufa).
That of the limestone atriums (outer walls of the houses of ashlar-work of Sarno limestone, inner walls with framework of limestone blocks, filled in with small pieces of limestone).
The limestone used is from Penmon, 4 m.
The mother-church of St Elliw, or Elli (whence the town derives its name) has been practically rebuilt (1906), but it retains its 13th-century tower and other ancient features of the original fabric. Its situation on a broad estuary and its central position with regard to a neighbourhood rich in coal, iron and limestone, have combined to make Llanelly one of the many important industrial towns of South Wales.
From the latitude of Bagdad northward the region between the two rivers is an arid, waterless, limestone steppe, inhabited only by roving Arabs.
The wall was pierced by "the gate of Assur," "the gate of the Sun-god," "the gate of the Tigris," &c., and on the river side was a quay of burnt brick and limestone cemented with bitumen.
On a hill overlooking the city is a beautiful school-house of native limestone, erected by the American military government as a model for the rest of the island.
It occupies a ridge or promontory, which juts out into the Adriatic Sea, under the bare limestone mass of Monte Sergio.
Between the Palaeozoic area near Ottawa, and Georgian Bay to the north of the region just referred to, there is a southward projection of the Archaean protaxis consisting of granite and gneiss of the Laurentian, enclosing bands of crystalline limestone and schists, which are of interest as furnishing the only mines of "Old Ontario."
The construction of the Via Venti Settembre gave occasion for the discovery of a number of tombs, 85 in all, the bulk of which dated from the end of the 5th and the 4th centuries B.C. The bodies had in all cases been cremated, and were buried in small shaft graves, the interment itself being covered by a slab of limestone.
The Nebrodian Mountains, a limestone range connected with the Peloritan range and having an east and west trend, rise to a somewhat greater height, and farther west, about the middle of the north coast, the Madonie (the only one of the groups mentioned which has a native name) culminate at the height of nearly 6500 ft.
Whereas other remains attributable to their villages or settlements are rare, their rock-hewn tombs are found by the thousand in the limestone cliffs of south-eastern Sicily.
A considerable export trade in copper, tin and granite was formerly carried on, and the last is still exported, hut the chief trade is in grain; while timber, coal and limestone are imported.
The Public Library with walls of white limestone and Texas granite, contained (1908) 95,000 volumes.
Tin ore of excellent quality is found in the province of Bauchi, alkali salts are abundant in Kano province, iron ore and red and yellow ochres are found in Kontagora and other provinces, kaolin (china clay) and limestone in the west central regions.
The Delta coast-line, composed of sandhills and, occasionally, limestone rocks, is low, with cape-like projections at the Nile mouths formed by the river silt.
The average width of the .cultivated land is about I0 m., of which the greater part lies on the left (western) bank of the river; and outside this is a belt, varying from a few hundred yards to 3 or 4 m., of stony and sandy ground, reaching up to the foot of the limestone cliffs, which rise in places to as much as 1000 ft.
Oases.In the western desert lie the five large oases of Egypt, namely, Siwa, Baharia, Farafra, Dakhla and Kharga or Great Oasis, occupying depressions in the plateau or, in the case of the last three, large indentations in the face of limestone escarpments which form the western versant of the Nile valley hills.
The cliffs bordering the Nile are largely quarried for limestone and sandstone.
Yet even the buried portions of limestone buildings have seldom been permitted to survive on the cultivated land; the Nubian sandstone of Upper Egypt was of comparatively little value, and, generally speaking, buildings in that material have fallen into decay rather than been destroyed by quarrying.
On the east bank are the limestone quarries of Turra arid Masara opposite Memphis.
The chief of these was limestone of varying degrees of fineness, composing the cliffs which lined the valley from the apex of the Delta to the neighborhood of El Kab; the best quality was obtained on the east side opposite Memphis from the quarries of Turra and Masgra.