File:Image from page 56 of "Water reptiles of the past and present" (1914) (14749975976).jpg
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[edit]DescriptionImage from page 56 of "Water reptiles of the past and present" (1914) (14749975976).jpg |
Identifier: waterreptilesofp1914will Title: Water reptiles of the past and present Year: 1914 (1910s) Authors: Williston, Samuel Wendell, 1851-1918 Subjects: Aquatic reptiles Publisher: Chicago, Ill., The University of Chicago Press Contributing Library: Boston Public Library Digitizing Sponsor: Boston Public Library
Click here to view book online to see this illustration in context in a browseable online version of this book.
Text Appearing After Image: 46 WATER REPTILES OF THE PAST AND PRESENT The periods of the Paleozoic era are the Cambrian, Ordovician,Silurian, Devonian, Carboniferous, and Permian, in the order asgiven; those of the Mesozoic era are the Triassic, Jurassic, andCretaceous; those of the Cenozoic era, the Eocene, Oligocene,Miocene, Pliocene, Pleistocene, and Recent. As a relic of an oldclassification we still often divide the Cenozoic into two quitearbitrary divisions, the Tertiary and the Quaternary, the latterincluding the Pleistocene and- Recent only. The same may besaid regarding the limits of each of these periods as of the eras;the sole problem is to make each period contemporaneous through-out the world, an exceedingly difficult problem, because no faunasor floras have ever been the same over the whole earth. Indeed,with the exception of some of the lowliest and most generalizedforms, or man himself, no species are the same throughout theearth today. Inasmuch as we must depend upon the fossils in therocks for
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Source | Image from page 56 of "Water reptiles of the past and present" (1914) |
Author | Internet Archive Book Images |
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