96 



TITANOTHBEES OF ANCIENT AVYOMING, DAKOTA, AND NEBEASK.V 



tive of new migrations into the Rocky Mountain 

 region than of new physiographic conditions favor- 

 able to the fossilization of some of the upland and 

 meadow Herbivora that had been evolving in the 

 adjacent Plains region but had not mingled with the 



fluviatile, swamp, and forest-border fauna that 

 inhabited the Uinta Basin in Uinta B time. 



The following summary of the later Eocene faunas 

 of the Uinta Basin should be examined in connection 

 with Figures 63-66. 



Composite section of mammalian faunas of tlie late?' Eocene sediments of the Uinta Basin 



[After Peterson, Osborn, Riggs, and Douglass] 



Uinta C (true Uinta formation = Diplacodon 

 zone); 600 feet. Badlands like those of 

 South Dakota, but of brick-red color. 

 Brownish and reddish ferruginous sand- 

 stones and clays (Peterson). 



Uinta B 2 (Eobasileus-Dolichorhiniis zone) ; 

 300-400 feet. Section along gilsonite vein 

 No. 2 (Riggs). Includes "Amynodon sand- 

 stone," gray and greenish clays, ferruginous 

 sandstones, bluish and greenish shales. 

 Two red layers with fossiliferous sandstone 

 between (Douglass). Supposed base of 

 horizon B 2. 



Uinta B 1 (Metarhinus zone = upper Meta- 

 rhinus zone of Riggs) ; 400 feet. Section on 

 divide between White River Canyon and 

 Coyote Basin (Riggs) . Also section 3 miles 

 below mouth of Evacuation Creek (Riggs) : 

 "Metarhinus sandstone." 

 "Eobasileus sandstone" = massive ledges 

 of reddish sandstone, alternating with 

 layers of sandy shales. 

 Indurated clays. 



Uinta A (lower A of Peterson, lower Meta- 

 rhinus zone of Riggs) ; 500 feet (Riggs) ; 585 

 feet (Douglass). Section in north wall of 

 White River Canyon (Riggs) : 



"Columnar sandstones, about 300 feet 

 thick, weathering as bold cliffs, or but- 

 tresses along the canyon of White 

 River. Color slightly more grayish 

 than the underlying shales, but brown 

 predominates (Riggs). 

 "Two hundred feet friable sandy shales, 

 weathering in steep slopes, with hori- 

 zontal outcroppings of nodular or 

 sandy layers, or by massive ledges of 

 limited extent" (Riggs). 



Green River (?) formation. Shaly gray sand- 

 stone of lacustrine origin. 



Titanotheres 



Diplacodon elatus, type. 

 Protitanotherium emarginatum. 

 Protitanotherium superbum, type. 

 Telmatherium ultimum, type. 

 Manteoceras uintensis, type. 



Eotitanotherium osljorni, type. 

 Dolichorhinus cornutus ( = hyogna- 



thus), type. 

 Dolichorhinus fluminalis, type. 

 Dolichorhinus heterodon, type. 

 Sthenodectes incisivus, type. 

 ?Rhadinorhinus diploconus, type. 

 Dolichorhinus longiceps, type (near 



base) . 



Dolichorhinus superior, type. 

 Metarhinus riparius, type. 

 Metarhinus earlei. 

 "Telmatherium," large jaw. 

 Dolichorhinus longiceps. 

 Rhadinorhinus abbotti, tj-pe. 

 Metarhinus fluviatilis, tyjje. 

 Dolichorhinus longiceps, skeleton. 

 Metarhinus riparius (from base). 

 Sphenocoelus. 



Heterotitanops parvus. (=?Meta- 

 rhinus), from base of B 1. 



None. 



Other forms of life 



First oreodonts. 



Cameloids. 



Dichobunids. 



Aquatic rhinoceros (Amynodon). 



Small perissodactyls (tapiroids, lophio- 



donts, Epihippus). 

 Last creodonts, Meson\-chidae and 



Oxyaenidae. 

 No amblypods found. 



Last ambly pod (Eobasileus). 



First cameloid (Protylopus). 



Last taeniodonts (Stylinodon). 



Aquatic rhinoceros (Amynodon). 



Primitive entelodont (Protelotherium 

 uintense) . 



Remains of plants and fishes; oc- 

 casionally plentiful in sandstone 

 ledges (Peterson) . 



Last primates ("Notharctus"). 



Giant creodonts, Mesonychidae (Har- 

 pagolestes) . 



Giant creodont (Harpagolestes). 



Crocodiles. 



Turtles. 



Giant amblypod (Eobasileus). 



Light-limbed perissodactyl (Triplopus). 



Creodonts, Mesonychidae (Mesonyx). 



None. 



No mammals (Peterson, Riggs). 



Fragments of turtles. 



Unios. 



Remains of plants and occasionally 



large tree trunks in sandstone ledges 



(Peterson). 



Remains of plants, fishes, and insects 

 in the shales (Peterson). 



