The apex is occupied by a massif of crystalline rocks.
The passes at both ends of this snow-clad massif lie at altitudes of 15,990 ft.
The later beds of the island belong to the Jurassic, Cretaceous and Tertiary systems. At the western foot of the Ida massif calcareous beds with corals, brachiopods (Rhvnchonella inconstans, &c.) have been found, the fossils indicating the horizon of the Kimmeridge clay.
He accordingly retired into the solitudes of Pietralata, and subsequently founded with some companions under a rule of his own creation the abbey of San Giovanni in Fiore, on Monte Nero, in the massif of La Sila.
The overthrust came from the south-east, and the Palaeozoic beds were crushed and crumpled against the ancient massif of the central plateau.
But by this time the ancient Palaeozoic chain had become a part of the unyielding massif, and the folding did not extend beyond its foot.
The rocks of Falcon are believed by Sievers to belong to the Andean system; while the outlying peninsula of Paraguana probably belongs, geologically, to the same massif as Goajira and the Sierra Nevada de Santa Maria in Colombia.
The oldest rocks in the country are the granites, gneisses, &c., of the southern massif and the crystalline schists which form the axis of the Cordillera and the Caribbean chain.
The southern flank is formed by the massif of the Reichensteiner Gebirge, which culminates in the Hochthor (77 80 ft.) and belongs to the north Styrian Alps, also called Eisenerzer Alps.
Of the sea on the north-eastern escarpment of the Futa Jallon highlands, the massif where also rise the head-streams of the Senegal and some of the Niger tributaries, besides the Rio Grande and many other rivers flowing direct to the Gulf of Guinea.
Beyond that it swells out into the vast massif of Anambaruin-ula, which is traversed by at least three minor parallel chains.
Martel, Le Massif de la Bernina (1894); J.
Ter ?, (-- ï¿½?s'`4" Gn Metamorphic Rocks Subalpine Alagelfluh Rigi Ter Jr Schiichenthal Cretaceous & Eocene Range A Aar Massif Gotthard Massif,, ',ï¿½?'
Except along the southern border of the Ardennes, and at one or two points in the middle of the Palaeozoic massif, Triassic and Jurassic beds are unknown in Belgium, and the Palaeozoic rocks are directly and unconformably overlaid by Cretaceous and Tertiary deposits.
The oldest rocks, belonging to the Archaean system, occur in the south, forming the Vosges and the Black Forest in the west, and the greater part of the Bohemian massif, including the Erzgebirge, in the east.
Carboniferous and Devonian beds are also found south-east of the Bohemian massif, where lies the extensive coal-field of Silesia.
Along the southern margin of the Triassic area there is a long band of Jurassic beds dipping towards the Danube; and at its eastern extremity this band is continuous with a synclinal of Jurassic beds, running parallel to the western border of the Bohemian massif, but separated from it by a narrow strip of Triassic beds.
Trend, and, save for the two gulfs into which it is divided by the massif of Sinai, is not deeply indented.
The massif of Ararat rises on the north and east out of the alluvial plain of the Aras, here from 2 500 ft.
Out of the massif rise two peaks, "their bases confluent at a height of 8800 ft., their summits about 7 m.
Inland by a line of cliffs, the Susu Hills, which form the first step in the terrace-like formation of the interior, culminating in the massif of Futa Jallon, composed chiefly of Archean and granite rocks.
Consisting of red sandstones, mudstones and conglomerates, they are inclined at high angles usually away from the granite massif and the encircling metamorphic rocks.
Nor were the numerous gallant attempts to capture the all-important ridge of Monte Tomba-Monfenera, which ran down from the Grappa massif to the Piave, more successful in breaking through the thin Italian lines.
Towards the northern extremity of the range occur a group of peaks, which together form an oblong block or " massif °' amongst the neighbouring ridges known as " Kaisargarh " amongst the Sherani clansmen who occupy it; and as the " Takht-i-Suliman " (Solomon's throne), generally, on the frontier, from the fact of a celebrated shrine of that name existing near its southern abutment.
The massif of the Takht is a high tableland (about 8000 f t.
These two channels carry the rush of mountain streams from the western slopes of the massif right across the axis of the mountains and through the intervening barrier of minor ridges to the plains of the Indus.
The following ranges belong to the Transmontane system, which is the southern extension of the mountains of Galicia: Peneda (4728 ft.), forming the watershed between the river Lima and the lower Minho; the Serra do Gerez (4817 ft.), which rises like a gigantic wall between the Lima and the Homem, and sends off a spur known as the Amarella, Oural and Nora, south-westward between the Homem and the Cavado; La Raya Seca, a continuation of Gerez, which culminates in Larouco (4390 ft.) and contains the sources of the Cavado; Cabreira (4196 ft.), which contains the sources of the river Ave and separates the basin of the Tamega from that of the Cavado; Marao (4642 ft.), Villarelho (3547 ft.) and Padrella (3763 ft.), forming together a large massif between the rivers Tamega, Tua and Douro; and Nogueira (4331 ft.) and Bornes (3944 ft.), which divide the valley of the Tua from that of the Sabor.
The cordilleras, divided into two great parallel chains, with flanking ranges and spurs to the east, reach their greatest breadth at this point and form the massif of the Andean system.
From an orographic point of view, Bohemia constitutes amongst the Austrian provinces a separate massif, bordered on three sides by mountain ranges: on the S.W.
The northern part (Czech Cesky Les) attains in the massif of Czerkov an altitude of 3300 ft., but the southern part (Czech Sumava) is at the same time the highest and the most picturesque part of the range, including on the Bohemian side the Osser (4053 ft.) and the Plockenstein (45 1 3 ft.), although the highest peak, the Arber (4872), is in Bavaria.
The mountain-ranges of the interior of Bohemia are the Brdywald (2798 ft.) in the middle; the Tepler Gebirge (2657 ft.), the Karsbader Gebirge (3057 ft.) and the Kaiserwald (3238 ft.), in the north-west part; while the northern corner is occupied by the Mittelgebirge (2739 ft.), a volcanic massif, stretching on both sides of the Elbe.
A syenite massif of this age occurs at Mittagong; and leucite has been discovered in Carboniferous basalts by David.
Below the level of the mountains, another massif rises in a direct line south.
Sieger has traced a series of isobasic lines, or lines of equal rate of elevation, for portions of Sweden and Finland; these indicate that the movement is now almost nil along the axial lines of the Baltic and the Gulf of Finland, but increases in amplitude northwards to the Gulf of Bothnia and in the direction of the main ridge of the massif of southern Sweden.
The principal folding took place towards the close of the Carboniferous period, and the massif is a fragment of an ancient mountain chain, the Variscische Gebirge of E.
Since the close of the Cretaceous period the Bohemian massif has remained above the sea; but the depression which lies immediately outside the Carpathian chain has at times been covered by an arm of the sea and at other times has been occupied by a chain of salt lakes, to which the salt deposits of Wieliczka and numerous brine springs owe their origin.
In the Archean region these are very noticeable near Lake Itasy, in the massif of Ankaratra (an ancient volcano) and in Vakinankaratra (at Betafo, Antsirabe, &c.); while there are numerous outflows of doleritic rocks, probably from faults, along the eastern side of the island and almost parallel with the coast line.
The Carpathians, which, extending in the form of an arc, form the boundary between Galicia and Hungary, are divided into the West and the East Beskides, which are separated by the northern ramifications of the massif of the Tatra.
The crystalline massif, therefore, presents a solid block which has remained elevated since early palaeozoic times, and against which earth waves of several geological periods have broken.
Geology.Geologically the Spanish Peninsula consists of a great massif of ancient rock, bordered upon the north, east and south by zones of folding in which the Mesozoic and early Tertiary beds arc involved.
The massif is composed of Archean, Palaeozoic and eruptive rocks, partly concealed by a covering of Tertiary strata~ but characterized by the absence, excepting on its margins, of an~ marine deposits of Mesozoic age.
The rocks which form it are often strormgl3 folded, but the folding is of ancient date and strikes obliquely acrosm the massif and has had no influence in determining its outline.
Th massif is in fact merely a fragment of the great Hercynian niountair system which was formed across Europe at the close of the Carboni ferous period.
Near Lake Posso, in the centre of the island, the mountains are higher; the Tampiko massif has a height of nearly 5000 ft., the chains south and west of the lake have a general altitude of about 5450 ft., with peaks still loftier.
The curvature of the range around the Brazilian massif, and the position of the zone of older rocks upon the eastern flank, led Suess to the conclusion that the Andes owe their origin to an overthrust from east to west, and that the Vorland lies beneath the Pacific. In the south Wehrli and Burckhardt maintain that the thrust came from the west, and they look upon the ancient rocks of Argentina as the Vorland.
And on the north the Palaeozoic massif of the Ardennes.