DEPARTMENT OF VERTEBRATE PALZONTOLOGY. 
===) HE field work carried on by the Department of Ver- 
Ni tebrate Plaontology in the Bridger Badlands in 
7] 1903 was continued during the season of 1904 by 
another expedition under the charge of Mr. Walter 
Granger. Parts of the region not visited or but 
slightly worked the previous year were carefully explored and 
much valuable and important material was obtained. 
The Bridger beds are a Middle Eocene deposit in the south- 
western part of Wyoming and lie for the most part between the 
Union Pacific railroad and the Utah State line. They cover an 
area of about two thousand square miles and represent a total 
thickness of nearly two thousand feet. In many places through- 
out this area, especially along the streams, these beds are cut and 
weathered into rough, rugged and very picturesque badland bluffs 
and slopes which have yielded to collections a large variety of 
very interesting fossil mammals as well as remains of turtles, 
crocodiles, lizards, fishes and birds. The first mammals to be re- 
ported from these beds were described about 1870 by Dr. Leidy 
from specimens secured by the Hayden Survey and by people 
residing at Fort Bridger. Since that time the country has been 
searched over by various parties, notably those sent out by Yale 
and Princeton Universities, the American Museum and by Pro- 
fessors Cope and Leidy 
The expedition from this Museum in 1893 which visited this 
locality and also the Washakie Beds, a nearly contemporaneous 
deposit lying some seventy-five miles to the westward, was for- 
tunate in securing numerous skulls and some skeletal parts of 
Uintatherium, a large rhinoceros-like animal with three pairs of 
horns and a very large, flat, curved tusk or canine. This was 
by far the largest and most striking of the animals of this period. 
There was not sufficient material with which to compose a skele- 
ton, however, and one of the chief objects of the expeditions of 
1903 and 1904 was to secure the material necessary for a com- 
plete restoration of this beast, or better still a complete skeleton 
of one individual. The first season the party was working most 
of the time outside of the rather restricted area of the basin in 
which the uintatheres are found, but this year two important 
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