The volcanic fissures that allowed of the upwelling of basalt are represented by numerous dykes, many cutting the earlier lava-flows as well as all the beds below them.
Dykes and intrusive rocks are common.
In Kent county there are more than 60,000 acres of tidal marshland, some of which has been reclaimed by means of dykes; Cypress Swamp in the extreme S.
Dykes Campbell (1894); his letters were edited by E.
The The siege dykes were cut, the land flooded, but again and again and relief a relieving force was baulked in its attempts to reach of Leiden.
Now, the dykes were cut and the sluices opened, and Amsterdam was covered by a wide inundation, against which the invader was powerless.
Diabases pierce to Devonian rocks, and olivine rocks appear as dykes amidst the Triassic deposits.
The dykes were cut, and Don Frederick, fearing for his communications, beat a hasty retreat (August).
He would never give up Holland; rather than do that, he would cut the dykes and give back that land to the sea.
After passing through some narrow gorges near Sisteron the bed of the river becomes wide, and spreads desolation around, the frequent overflows being kept within bounds by numerous dykes and enbankments.
But between the Lake of Zurich and the Walensee the huge desolate alluvial plain grew ever in size, while great damage was done by the river, which overflowed its bed and the dykes built to protect the region near it.
Sheets of diabase, apparently volcanic flows, and numerous dykes interfere with the regularity of the stratification.
The oldest rocks consist of granite and schist, penetrated by intrusive dykes, and upon this foundation rest the flat-lying sedimentary deposits, beginning with a sandstone like the Nubian sandstone of Egypt.
It falls into three distinct parts: (1) the largest portion, with the city of Bremen, lying on both banks, but chiefly on the right, of the lower course of the Weser, surrounded by the Prussian province of Hanover and the grandduchy of Oldenburg, and consisting in the main of lowland country intersected by canals and dykes; (2) the town and district of Vegesack, lying separate from, but immediately north of the main portion, on the right bank of the river; (3) the port of Bremerhaven, 46 m.
From the many cattle-folds and walls of defence scattered over the country, and ruins of ancient settlements, it is also evident that at that period stone-dykes were very common.
So, too, with places that have to be crawled over between trees, or with dykes to be crawled down.
The rolled crystals of sapphire occur, with garnet and other minerals, in glacial deposits, and have probably been derived from dykes of igneous rocks, like andesite and lamprophyre.
From Gorinchem the New Merwede (constructed in the second half of the 19th century) extends between dykes through the marshes of the Biesbosch to the Hollandsch Diep. These great rivers render very important service as waterways.
With the true pipes are associated dykes and fissures also filled with diamantiferous blue ground.
Rhymer's Tower was crumbling to pieces, and its stones were being used in the erection of dykes, cottages and houses, when the Edinburgh Border Counties Association acquired the relic and surrounding lands in 1895, and took steps to prevent further spoliation and decay.
These fissures with the basalt that solidified in them now form the vast assemblage of dykes which cross Scotland, the north of England and the north of Ireland.
It forms part of an intrusive mass which, on the south and west cliffs of the island, has a columnar arrangement and is traversed by dykes of dolerite, most of which run in a northwest direction.
Then came innumerable varieties of manual work for the erection and keeping up of hedges, the preservation of dykes, canals and ditches, the threshing and garnering of corn, the tending and shearing of sheep and so forth.
In the south of the island there are sills and dykes of felsite, quartz-porphyry, rhyolite, trachyte and pitchstone.
It is seldom more than a few feet above the sealevel, while at places it is below it, and it has consequently to be defended by an extensive _ system of dykes or embankments resembling those of Holland.
In the north the Pennine region is joined to the Southern Uplands of Scotland by the Cheviot Hills, a mass of granite and Old Red Sandstone; and the northern part is largely traversed by dykes of contemporary volcanic or intrusive rock.
The most striking of these dykes is the Great Whin Sill, which crosses the country from a short distance south of Durham almost to the source of the Tees, near Crossfell.
There the resistance of a series of igneous dykes gives prominence to the Pembroke peninsula, in which the fine fjord-like harbour of Milford Haven lies far out towards the Atlantic. The coast north of Pembroke and Merioneth has been worked into the grand sweep of Cardigan Bay, its surface carved into gently rounded hills, green with rich grass, which sweep downward into wide rounded valleys.
Of sea-level; the seaward edge in many places is below the level of high tide, and is protected by dykes as in Holland, while straight canals and ditches carry the sluggish drainage from the land.
A region where volcanic activity has led to the embedding of dykes or bosses of hard rock amongst softer strata produces a plain broken by abrupt and isolated eminences.'
It is divided by whin-dykes into the Little Causeway, the Middle Causeway or "Honeycomb," as it is locally termed, and the Larger or Grand Causeway.
It is worthy of note that the dykes and sheets of felsite are seldom pierced by the basalt dykes and are probably about the most recent of the intrusive rocks.
Finally the basic dykes of dolerite, basalt and augite-andesite are abundant and traverse the various sedimentary formations and the granite.
Cretaceous Jurassic N k Bodorno :s: Vladikaukaz Lars `n - - - n ° Tiflis a =Plain of Vladikaukaz; b= Upper Jurassic; Moraine terrace; d= Folded lias shales; e = Upper Jurassic; = Paleozoic schists; Creenstone dykes; h= Granite; g°= Gneiss; i = Andesites; k = Jurassic?; I = Pliocene fNagelfluh); m = Miocene; 11 = Oligocene; r = Nullipore limesto n e & conglomerate.
The city held out obstinately against the pretensions of the stadtholders, and in 1650 opened the dykes in order to prevent William II.
In 1621, on the expiration of the twelve years' truce with Spain, the breaking of the dykes drove him from his farm.
Dykes and intrusive sheets, most of which end at the folded belt, are also numerous.
Dykes in Expository Times, Jan.
The brothers de Witt, in consequence of their fresh offer to treat at any price, were assassinated; the broken dykes of Muiden arrested the victorious march of Cond and Turenne; while the popular and military party, directed by the stadtholder William of Orange, took the upper hand and preached resistance to the death.
The south-east parts are perfectly flat; and about one-third of the county consists of fens and marshes, intersected in all directions by artificial drains, called locally dykes, delphs, drains, becks, learns and eaux.
He and his brother took an active part in local affairs, and in 1846 he was appointed Deichhauptmann, an office in which he was responsible for the care of the dykes by which the country, in the neighbourhood of the Elbe, was preserved from inundation.