File:Geology (1907) (14776012422).jpg

Identifier: geology00cham (find matches)
Title: Geology
Year: 1907 (1900s)
Authors: Chamberlin, Thomas C. (Thomas Chrowder), 1843-1928 Salisbury, Rollin D., 1859- joint author
Subjects: Geology
Publisher: New York, H. Holt and co.
Contributing Library: Internet Archive
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100 GEOWOY. and western America While they were less gigantic than the sauro-pods, they found compensation in protective plates, spines, and similarmodes oi defense. The Stegosaurus of Colorado and Wyoming (Comobeds) was one of the most unique, (Fig. 373.) The remarkably diminv •
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Fig. 373.—Stegosaurus, an armored dinosaur of the Jurassic. Interpreted by CharlesR. Knight. (Lucas Animals of the Past. By peimission of the publishers, MessrsMcClure, Phillips and Company.) tive head and small brain imply a sluggish, stupid beast, dependingfor protection on its bulk and armor. The prevalence of so many of these dinosaurs on the North Americanand the Eurasian continents seems to imply that these lands wereconnected, and that they were the chief dinosaurian home, though dino-saurs have been identified in South Africa in beds probably Triassic.1 Other reptilians.—The true rhynchocephalians first made theirappearance during the Jurassic, in forms scarcely distinguishablefrom the living Sphenodon, but they played no conspicuous role. Tur-tles became abundant, though distinctively marine forms had not yetappeared. The crocodilians, though still retaining the primitivetype of biconcave vertebra?, became differentiated into the marinethalattosuchians, the long-headed, g

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