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Succession of Formations In the third, all the ftrata are conformable, fo that the fijbjacent and fuperincumbent ftrata haye the fame direction with the bed which forms the cap. Primitive greenftone in clay-flate, fometimes forms caps oi this kind. . GENERAT ACCOUNT OF THE DIFFERENT FORMA TIONS, IN REGARD TO THEIR SUCCESSION);AND STRATIFICATION, AND THIS ILLUSTRATEDi.BY A « SHORT DESCRIPTION OF THE HA8.TZ,' AND, THE SAXON ERXGEBIRGE. "''-i ":t hr;; • I «. HERE is a great clafs of rocks which lies under every other, but never over any of them ; it is therefore the oldeft, and, as far as we know, the fuft formed. It is denpminated the Primitive Clafs. The rocks belonging to this clafs have a cryftallinc appearance, intimating, that they have been precipitated from a ftate of chemical lolution. They are principally compo- fed of filiccous, argillaceous and magnefian earths. ^ Granite, • I c CHAP. IV,