. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. 168 THE AGE OF MAMMALS {Dolichorhinus, Amynodon, and fEohasileus) are also found in the Middle Uinta, south of the Uinta Mountains; several other genera are common to these two formations. Middle Uinta: fEobasileus Zone. — This level is believed to be of the same age as the Upper Washakie because of the presence of a great abun- dance of the long-skulled titanothere Dolichorhinus of the species D. liyogna- thus. Other titanotheres abundant here are of the supposed fluviatile or Metarhinus type. Among rhinoce
. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. 168 THE AGE OF MAMMALS {Dolichorhinus, Amynodon, and fEohasileus) are also found in the Middle Uinta, south of the Uinta Mountains; several other genera are common to these two formations. Middle Uinta: fEobasileus Zone. — This level is believed to be of the same age as the Upper Washakie because of the presence of a great abun- dance of the long-skulled titanothere Dolichorhinus of the species D. liyogna- thus. Other titanotheres abundant here are of the supposed fluviatile or Metarhinus type. Among rhinoceroses, two phyla, namely, the light-limbed ^i^. 'y»,v •? " V' v\ X • * W,.; %.. Fig. 68. — Upper Eocene Uinta Formation, near the mouth of White River, Utah. Base of Uinta, Horizon C. The true Dipiacodon Zone. Wortman and Peterson prospecting. Photograph by American Museum of Natural History, 1895. hyracodonts (Triplopus) and the amynodonts (Fig. 75) occur. These amynodont rhinoceroses are distinguished by powerfully developed upper and lower canine teeth; they now considerably exceed the existing tapirs in size. This geological level is also distinguished as containing liml) Ijones of the last known survivors of the great Amblypoda, but these animals have not as yet been specifically determined. Another distinguishing feature is that the Artiodactyla are more numerous and varied because it is at this stage that we first know of the existence in America of the very important family of Hypertragulidse {Leptotragulus, Leptoreodon), small selenodont ruminants which were at one time believed to be ancestral to the camels and oreodonts, but are now considered (Matthew) distinct. The entelodonts are represented by Protelotherium, a successor of Achicno- don. Among the unguiculates, two families of rodents are recorded: (1) Is- chyromyidae (Paramys), and (2) Heteromyidte (Protoptychus). Of the archaic Carnivora the oxysenids and mesonychids still survive, the latter fami
Size: 2239px × 1116px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectpaleontology, bookyea
