188 7] Mesozoic and Cenozoic of North America. 455 
There are three widely-separated localities of this formation. 
One is in the South Park of the Rocky Mountains, Colorado, 
another at Elko and Osino, in Northeastern Nevada, and the 
third is in Central Oregon, where it lies, according to Condon 
immediately below the John Day formation. 
MUTUAL RELATIONS OF THE Eocene Formations.—Where the 
Bridger beds rest on the Wasatch, which I only know to be the 
case in the Washakie basin, in Wyoming, they are conformable. 
The Uinta beds are, on the contrary, not conformable to the 
Bridger beds, according to King. The relations of the Wind 
River beds to the Wasatch remain undescribed. 
, 
MIOCENE SYSTEM. 
The formations of the Miocene in the interior of North Amer- 
ica are the following: 
Loup Fork, 
Ticholeptus, 
John Day, 
White River. 
These horizons represent succession in time. A formation 
whose relation with the Loup-Fork epoch is yet uncertain has 
been named “ The Dalles.” 5? The four series each possess well- 
marked faune, whose distinguishing features are enumerated 
ow. 
Waite River.—Vammalia. Presence of a few Lemuroidea (?) 
and Creodonta, Amynodon.(Scott and Osborn), Hyracodon, Cryp- 
- toproctide, Poébrotheriide, Tragulidz, Elotheriidz, and Meno- 
dontide. Absence of Felidæ, Ursidæ, and Rodentia, except 
_Sciuridz and Leporidz ; of Camelidz, Equidz, and Proboscidia.33 
There are three areas of this formation. The most extensive 
is the most southern, and occupies a large tract along the White 
River, in Northern Nebraska35 and Southern Dakota, and ex- 
tends westward into Wyoming and southwestward into North- 
eastern Colorado. The second is much smaller, and is situated 
in Central Dakota, two hundred miles north of the nearest 
point of the southern tract.5* The northernmost White River 
formation is in Soutlfern Canada, in the district of Assiniboia, 
and is intermediate in extent between the two previously-men- 
tioned areas.55 Some faunal differences have been noticed be- 
tween these areas, which may be due to geographical distribution, 
