58 Scientific Intelligence. 
with Dr. F. M. Endlich as geologist, covers rectangle No. 57, which 
is bounded by meridians 107° and 109° 30’, and parallels 41° 45’ 
d 43°, embracing about 10,800 square miles. The k 
the field at Salt Wells station, on the Union Pacific Railroad, and 
been of late Tertiary outflow, and quite extensive, the region is 
occupied by sedimentary or stratified rocks; which he refers to 
Lower Silurian, Carboniferous, J ura-T'riassic, Cretaceous and Ter- 
tiary ages. Th 
all parts of the district. Besides these, he mentions other deposits 
in the valley of Snake River, later than the Tertiary strata just 
referred to, but still probably of Tertiary origin. It seems 
y 
eale, may prove to be of the same age as the Lake Beds of Dr. 
Hayden in Middle Park, the Uinta Group of Mr. King, &e. 
