File:Geology (1907) (14589920497).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
Digitizing Sponsor: Internet Archive

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Fig. 410a.—Triceratops prorsus Marsh, from the Laramie Cretaceous. From a paint-ing by C. R. Knight in the U. S. National Museum. 17s GEOLOGY. heads and the smallest brains of the reptile race. They were doubt-less si upid and sluggish. The ornithopod division was represented by Trachodan, Claosaurus (Eg. Ill) and kindred genera. The posterior parts of all these were Btrongly developed, the limbs were hollow, and their footprints indi-cate that they walked in kangaroo-like attitude. Turtles, lizards, snakes, and crocodiles. —Although it is confidentlybelieved that the Trionijchia, or river turtles, one of the three or four
Text Appearing After Image:
Fig. 411.—A Cretaceous Dinosaur of the ornithopod division, Claosaurus annectens, (Restored by Marsh.) chief divisions of the Chelonia, had been differentiated long before,the earliest known representatives of the group are from the BellyRiver deposits of Canada. Of the true lizards which appeared in theTriassic, the only other Mesozoic form known is one of small size anduncertain affinities from the Laramie. True snakes made their firstappearance, so far as known, in the later part of the period, and allwere small. Among the crocodiles, the long-snouted teleosaurs (Tele-orhinus) persisted, in Xorth America at least, until well into the Cre-taceous; but for the most part the order underwent a marked changeearly in the period, developing into the modern type of crocodiles and THE CRETACEOUS PERIOD. 179 gavials. A few small salamanders, of modern type, are known fromthe late Cretaceous. The Pterosaurs.—The flying reptiles made so distinct an advancein specialization, that Williston

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