Image from page 470 of “The World book : organized knowledge in story and picture” (1918) – more Marine Life goodness curated by www.SardineRunPE.co.za
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Title: The World book : organized knowledge in story and picture
Year: 1918 (1910s)
Authors: O’Shea, M. V. (Michael Vincent), 1866-1932 Foster, Ellsworth D Locke, George Herbert, 1870-1937
Subjects: Encyclopedias and dictionaries
Publisher: Chicago : Hanson-Roach-Fowler
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive
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Text Appearing Before Image:
Present Glacial Pliocene Miocene Oligocene Eocene CretaceousJurassicTriassic Permian Carboniferous
Text Appearing After Image:
Ordovician Cambrian Keweenawan Animikean liuronian Igneous Rocks Granite Slate Linnestones ROCK SYSTEMS AND GEOLOGIC ERAS Animikean Period (see table). A few fossilshave been found in Proterozoic rocks, butthese are very rare. However, they make theexistence of life in this era a matter of cer-tainty. Other evidences are the presence ofcarboniferous shales and slates and of lime-stone. The Cambrian, the first period of the Paleo-zoic Era, is of special interest and importancebecause its rocks constitute the oldest systemknown that contains an abundance of fossils.It is therefore the first satisfactory record oflife. This system contains all the commonaspects of sedimentary rocks—conglomerates,sandstones, shales and limestones—but in mostregions the sediments have been cemented intosolid rock. In some cases the sandstones havebeen changed into quartz schists, the shalesinto slates and the limestones into marble.Most of the fossils represent the shells ortracks of marine animals bur
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