454 Mesozoic and Cenozoic of North America. [May 
the Wasatch. A probable second locality of this formation is 
known in Eastern Utah, in the Wasatch Mountains. The forma- 
tion is known as the Manti beds.47 
Bripcer.—Mammatia, Presence of Tillodonta, ? Condylarthra, 
and Dinocerata, Hyrachyus, Palzosyops, Amynodon, Triplopus, 
and Achznodon. Absence of Tzniodonta, Pantodonta, and 
selenodont Artiodactyla. 
Two divisions of this formation are sustained by Scott. These 
have been named the Bridger and Washakie respectively by 
Hayden, The former is represented by a single area, which is 
west of Green River, in Southwestern Wyoming. The latter is 
also known from but one area, which is also in Southwestern 
Wyoming, but is east of Green River. These divisions differ in 
the species they contain, very few, according to Scott, being 
common to the two. Amynodon is the only genus which in the 
Bridger seems to be confined to the Washakie division ; perhaps 
Triplopus has the same distribution. 
Another tract of the Bridger formation is known from Western 
Colorado, but to which of the two above divisions it is referable 
is unknown. 
The depth of the Bridger proper is, according to King, two 
thousand five hundred feet. I have given that of the Washakie 
as about twelve hundred feet. 
Uinta.—Mammatlia. Presence of Amynodon and Selenodont 
Artiodactyla. Absence of Pantodonta and Dinocerata (Scott). 
The facies of this fauna is more modern than that of the 
Bridger, and is clearly intermediate between it and that of the 
White River. One area is known, which is south of the Uinta 
Mountains, in the northeastern part of Utah. The thickness of 
the beds is not great, according to King.#9 
Amyzon Beps.’°—The exact horizon of this formation is not 
yet determined, but it is probably at the close of the Eocene or 
the opening of the Miocene. It is almost exclusively known 
palzontologically from fossil fishes, and these can be com 
with those of the Green River shales. The characters are; 
Presence of Catostomide, Siluridz, and Trichophanes, Absence 
of Osteoglosside, Gonorhynchidz, and Chromidide. , 
_ The only point of affinity with the Green River fauna is the 
Presence of Trichophanes, which is nearly related to Amphi- 
plaga of the latter. | | ees 
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