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A hard fissile slate of purple colour is based upon the ground-rock of grey granite; there is also a modern clay-slate, which lies unconformably to the older, and through it the great veins of gneiss and quartz seem to pass.
In many regions the metamorphic and granite rocks would be found much more widely extended than they appear to be, if all the sedimentary beds were removed which rest unconformably on them, and which could not have formed part of the original mantle under which they were crystallised.
Limestones are rare in this series, but one band of 300 feet in thickness has been traced for considerable distances to the north of Lake Huron. Beds of greenstone are intercalated conformably with the quartzose and argillaceous members of this series. No organic remains have yet been found in any of the beds, which are about 18,000 feet thick, and rest unconformably on the Laurentian rocks.
At a later period, the Pampean mud, of estuary origin, was deposited over a wide area, in one district conformably on the underlying old tertiary strata, and in another district unconformably on them, after their upheaval and denudation.
Those of Ayrshire have long been recognised as of the same period; as they rest unconformably on the coal measures, and consist of porphyrites, melaphyres, and tuffs of volcanic origin. Carboniferous Period. Volcanic rocks occur amongst the coal-measures of England and Scotland, while they are also found interbedded with the Carboniferous Limestone series in Derbyshire, Scotland, and Co.
The Secondary Rocks, in which our further researches are to be prosecuted, consist of a great and varied series, resting, generally unconformably, against flanks of the upturned primary rocks, sometimes themselves considerably inclined, at others, forming extensive basin-like beds, nearly horizontal; in many places, much broken up and shifted by disturbances from below.
In these ancient grits no fossils have been found, but they are supposed to be of Cambrian date, for Sir R. Murchison found Lower Silurian strata resting unconformably upon them.
We have seen in the preceding article upon the formation of mountains, that the dislocations thus produced show the interruptions between successive deposits: as, for instance, where certain strata are raised upon the sides of a mountain, while other strata rest unconformably, as it is called, above them at its base, this term, unconformable, signifying merely that the two sets of strata are placed at an entirely different angle, and must therefore belong to two distinct sets of deposits.
"So perhaps," resumed my father, "and not unconformably with sacred records, from one great parent horde came all those various tribes, carrying with them the name of their beloved Asia; and whether they wandered north, south, or west, exalting their own emphatic designation of 'Children of the Land of Light' into the title of gods. "And why the deuce could not they?" asked Mr. Squills.
Secondly, in this, as in the other dramas of Shakespeare, all the characters live, think, speak, and act quite unconformably with the given time and place.
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