. The story of the earth and man [microform]. Geology; Paleontology; Man; Géologie; Paléontologie; Homme. 192 THE STORY OP THE EARTH AND eastwards. Thus this later Jurassic period was the culmination of the Mesozoio, the peiiod of its most perfect continental development, corresponding in this to the Carboniferous in the Palaeozoic. The next or closing period of this great Mesozoic time brought a wondrous change. In the Cretaceous period, so called from the vast deposits of chalk };y which it is characterized, the continents sunk an they had never sunk before, so that vast spaces of the
. The story of the earth and man [microform]. Geology; Paleontology; Man; Géologie; Paléontologie; Homme. 192 THE STORY OP THE EARTH AND eastwards. Thus this later Jurassic period was the culmination of the Mesozoio, the peiiod of its most perfect continental development, corresponding in this to the Carboniferous in the Palaeozoic. The next or closing period of this great Mesozoic time brought a wondrous change. In the Cretaceous period, so called from the vast deposits of chalk };y which it is characterized, the continents sunk an they had never sunk before, so that vast spaces of the great continental plateaus were brought down, for the first time since the Laurentian, to the condition of abyssal depths, tenanted by such creatures as live in the deepest recesses of our modern oceans. This great depression afifected Europe more severely than Ame- rica ; the depression of the latter being not only less, but somewhat later in date. In Europe, at the period of greatest submergence, the hills of Scandinavia and of Britain, and the Urals, perhaps alone stood out of the sea. The Alps and their related mountains, and even the Himalayas, were not yet born, for they have on their high summits deep-sea beds of the Cretaceous and even of later date. In America, +he Appalachians and the old Laurentian ranges remained above water; but the Rocky Mountains and the Andes were in great part submerged, and a great Cretaceous sea extended from the Appalachians westward to the Pacific, and southward to the Gulf of Mexico, openinor probably to the North into the Arctic Ocean. This great depression must have been of very long continuance, since in Western Europe it sufficed for. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dawson, J. W. (John William), Sir, 1820-1899. Toronto : Copp Clark
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