. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. 458 THE AGE OF MAMMALS from it in the presence of the beaver (Castor) and the otter (Lutra), which are not found at Hay Springs, Rock Creek, Texas. —• (Fig. 194, 16.) These beds are extensively ex- posed in the Staked Plains of Texas (Fig. 166) along the south side of Tule Canon. As described above (p. 362), they represent a Lower Pleis- tocene river channel cutting its way into an older Miocene horizon. They are especially famous for the magnificent series of six skeletons of horses discovered by Gidley ^ i
. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. 458 THE AGE OF MAMMALS from it in the presence of the beaver (Castor) and the otter (Lutra), which are not found at Hay Springs, Rock Creek, Texas. —• (Fig. 194, 16.) These beds are extensively ex- posed in the Staked Plains of Texas (Fig. 166) along the south side of Tule Canon. As described above (p. 362), they represent a Lower Pleis- tocene river channel cutting its way into an older Miocene horizon. They are especially famous for the magnificent series of six skeletons of horses discovered by Gidley ^ in 1900 and referred to Equus scotti. (See Figs. 197 and 198.) In these beds are also found a peccary (Platygonus) and the. Fig. 199. -The Lower Pleistocene true horse of Texas, Equus scotfi. After original by Charles R. Knight in the American Museum of Natural History. imperial mammoth (E. imperator). Cope ^ had previously reported from Rock Creek a sloth (Mylodon sodalis), several species of horses, and two cameloids (Holomeniscus sulcatus, H. macrocephalus), as well as two large land tortoises. Silver Lake of the Oregon Desert. — (Fig. 194, 31.) One hundred and fifty miles northwest of the old Lahontan shore lines in the heart of the Oregon desert of the Great Basin, and twenty miles northeast of Silver Lake there is a slight depression in the desert perhaps twenty acres in extent marked Christmas Lake on the maps, to which Cope gave the name "Fos- sil ; This 'Silver,' 'Christmas,' or 'Fossil' lake region was succes- 1 Gidley, J. W., A New Species of Pleistocene Horse from the Staked Plains of Texas. Bull. Anier. Mus. Nat. Hist., Vol. XIIL no. 13, pp. 114-116; also Tooth Characters and Revision of the North American Species of the Genus Equus. Bull. Amer. Mus. Nat. Hist., Vol. XIV, Art. ix, 1901, pp. 134-137. 2 Cope, E. D., Report of the Geological Survey of Texas, 1892, 1893, p. Please note that these images are extracted from scanned page images th
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