1893.] The Titanotherium Beds. 205 
considerable portion of that country embraced between the 
Cheyenne, Missouri, and White rivers in S. Dakota, with a 
western continuation, extending along the eastern and south- 
ern slopes of the Black Hills, and westward to near the town 
of Douglas in Wyoming. While this exposure is seen to have 
a considerable extent from east to west, yet from north to south 
it is of very limited extent. This is due to avery slight dip 
of these beds to the southeast, where they soon pass under the 
overlying Oreodon and Loup Fork beds. That range of bluffs 
in southwestern S. Dakota, northwestern Nebraska and central 
Wyoming, known as Pine Ridge, may be considered as the 
southern limit of this exposure of the Titanotherium beds. The 
beds of this region occupy a considerable portion of south- 
western S. Dakota, extreme northwestern Nebraska, and a very 
narrow strip in central and eastern Wyoming. Besides this 
exposure of the beds, there are other isolated exposures at 
Long Pine, Nebraska; in northeastern Colorado; in Wyoming, 
along the Rattlesnake Range, north of the Sweetwater; and 
Professor Cope has described remains of Titanotheriide from 
Canada.’ 
Although the surface exposures of the Titanotherium beds 
are of comparatively small extent, yet from the distribution 
of these.exposures the beds are known to extend over a con- 
siderable portion of S. Dakota, Nebraska, Colorado, Wyoming, 
and perhaps portions of Montana and N. Dakota. 
DESCRIPTION OF THE DEPOSITS. 
The Titanotherium beds may be briefly characterized as a 
series of usually light colored, sometimes variegated clays, 
alternating with less extensive deposits of sandstones and con- 
glomerates, situated at the base of the Miocene and containing 
among other fossils the remains of Titanotherium and allied 
forms. 
The typical locality from which Meek and Hayden first 
named the Titanotherium beds and from which the latter first 
made and published a section of them, is also that locality in 
7Contributions to Can. Pal., Vol. iii, p. 8- 
