. Elements of geology : a text-book for colleges and for the general reader. Geology. JURA-TRIAS IX AMERICA. 467 teeth and bi-concave vertebrm; but the remains are too imperfect to permit distinct characterization. Mammals.—Lastly, in the same beds, Marsh has discovered some twenty-five species of small marsupial mammals. According to him, these early mammals were not typical Marsupials, but a generalized type connecting that order with Insectivora. He makes of them two sub-orders, Pantotheria and Allotheria. Figs. 753 and 754 are repre- sentatives of these two types. Physical Geography of the
. Elements of geology : a text-book for colleges and for the general reader. Geology. JURA-TRIAS IX AMERICA. 467 teeth and bi-concave vertebrm; but the remains are too imperfect to permit distinct characterization. Mammals.—Lastly, in the same beds, Marsh has discovered some twenty-five species of small marsupial mammals. According to him, these early mammals were not typical Marsupials, but a generalized type connecting that order with Insectivora. He makes of them two sub-orders, Pantotheria and Allotheria. Figs. 753 and 754 are repre- sentatives of these two types. Physical Geography of the American Continent during the Jura- Trias Period.—During Palaeozoic times the Atlantic shore-line was certainly farther east than it was subsequently, probably farther east than it is now (p. 288). At the end of the Palaeozoic occurred the Ap- palachian revolution. Coincidently with the up-pushing of the Appa- lachian chain, the sea-border probably went downward, and the shore-. Fig. 753.—Right lower jaw of Diplocynodon victor (after MarstO. outside view. Twice natural size: a, canine; b, condyle; c, coronoid process; d, angle. line advanced westward on the land. During the Jura-Trias the shore-line to the -north was still beyond what it is now, for no Atlantic border deposit is visible; and along the Middle and Southern States. 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 LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
