. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. THE HISTORY OF ANIMAL LIFE 397 extinct animals; paleobotany with extinct plants. The facts that have been revealed by such studies have aided greatly in arranging present-day animals and plants in their proper taxonomic rela- tionships. E/fAS CCNOZOIC MO/fC THAN l/! MILUOH CCNTURICS MESOZOIC ncahly i uillion CCNTVIieS PALEOZOIC I MILLION CtNTUKICS f-noTERozoic 10 MILLION CfNTUBICi ARCHEOZOIC to MILLION cenTu/fics PERIODS QUATERNARy TERTIARY CRETACEOUS JURASSIC TRIASSIC PERMIAN CARBONirEROUS D
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. THE HISTORY OF ANIMAL LIFE 397 extinct animals; paleobotany with extinct plants. The facts that have been revealed by such studies have aided greatly in arranging present-day animals and plants in their proper taxonomic rela- tionships. E/fAS CCNOZOIC MO/fC THAN l/! MILUOH CCNTURICS MESOZOIC ncahly i uillion CCNTVIieS PALEOZOIC I MILLION CtNTUKICS f-noTERozoic 10 MILLION CfNTUBICi ARCHEOZOIC to MILLION cenTu/fics PERIODS QUATERNARy TERTIARY CRETACEOUS JURASSIC TRIASSIC PERMIAN CARBONirEROUS DEVONIAN SILURIAN ORDOVICIAN CAMBRIAN APTHROPODA CHORDATA. Fig. 221.—Table of the geological eras and representative animal types. Representatives of all existing orders of animals are found among fossils, and in addition a considerable number of other orders that have become extinct. Thus our present-day forms represent only a portion of the number of types that have appeared. For convenience. 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 Buchanan, James William, 1888-. New York, London, Harper & brothers
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