. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. 204 THE AGE OF MAMMALS ences between these two proboscideans, and indicate that we may look for other radiations of the proboscidean stock in Africa; possibly the river-living sirenians may prove to be one of these radiations. Certain of the paliEomastodons attained an imposing size, but none of them rivaled the arsinoitheres. III. OLIGOCENE LIFE OF AMERICA Geologic conditions. — Widely contrasting with the limited and scattered deposits of Europe are the vast Badlands, or Mauvaises Terres, of the. OLIGOCENE
. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. 204 THE AGE OF MAMMALS ences between these two proboscideans, and indicate that we may look for other radiations of the proboscidean stock in Africa; possibly the river-living sirenians may prove to be one of these radiations. Certain of the paliEomastodons attained an imposing size, but none of them rivaled the arsinoitheres. III. OLIGOCENE LIFE OF AMERICA Geologic conditions. — Widely contrasting with the limited and scattered deposits of Europe are the vast Badlands, or Mauvaises Terres, of the. OLIGOCENE DEPOSITS Fig. 94. — Chief Oligocene deposits of fossil mammals in the Mountain Region of North America. 1. John Day, Oreg. 2. White River, S. Dak., Neb., Wyo. 3. Horsetail Creek and Cedar Creek, Col. 4. Pipestone Creek and Threeforks, Mont. 6. White Buttes, N. Dak. 6. Swift Current Creek, Assiniboia. 7. Bate's Hole, Wyo. western plains region which, as we now believe, represent the vestiges of extensive flood plains similar to those of many existing rivers in India and South America. Scattered over the surface at different points from British Columbia on the north to the Mexican plateau on the south are areas from two to three hundred miles east of the Rocky Mountains. For the most part they overlie not the Eocene, but the worn upper surfaces of the Cre- taceous (Fort Pierre), proving that while the Rocky Mountain basin de- posits were forming, the region of the Great Plains was an open, slightly undulating country, traversed by rivers and 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 Osborn, Henry Fairfield, 1857-1935. New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpaleontology, bookyea
