. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. 1*1 i 8 THE PLEISTOCENE. Ul. m\ iii. ki seems to have been improved. The clays deposited had few boulders and iiiany marine shells, and to the west and north there was land producing plants akin to those of the temperate regions; and in places slightly elevated above the water, peaty deposits accumu- lated. " The shells of the Leda clay indicate depth
. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. 1*1 i 8 THE PLEISTOCENE. Ul. m\ iii. ki seems to have been improved. The clays deposited had few boulders and iiiany marine shells, and to the west and north there was land producing plants akin to those of the temperate regions; and in places slightly elevated above the water, peaty deposits accumu- lated. " The shells of the Leda clay indicate depths of less tlian 100 fathoms. The numerous foraminifera, so fivr as lia/e been obser\ed, belong to this range, and I have never seen in the Leda clay the assemblage of foramiuiferal forms now dredged from 200 to 300 fatl'.oms in the Gulf of St Lawrence. " I infer that the subsidence of the Leda clay period and of the inter- glacial beds 01 Ontario belongs to the time of the sea beaches from 450 to 600 feet in height, which are so marked and extensive as to indicate a period of repose. In this period there were marine con- ditions in the lower and middle St and in the Ottawa valley, and swamps and lakes on 'lie upper Ottawa and the western end of Lake Ontario. i> is quite probable, nay certain, that during this intcrglaciai period re elevation had set in, since the upper Leda clay and the Saxicava sand indicate shallowing water, and during this re-elevation the plant-covered surface wonld extend to lower levels. " T!iis, however, must have been followed by a second subsidence, since the water-worn gravels and loose, fiir-travc'led boulders of the later drift rose to heights never reached by the till or the Leda clay, and attained to the tops of the highest hills of the St Lawrence valley, 1200 feet in height, and elsewhere to still greater elevations. This second boulder drift must iiave been wholly marine, and probably not of long duration. It shows no
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
