. Rocky Mountain Coal. 101 
ame 
standard barometer and the boiling apparatus side by side from 
the sea leavel up to 15,705 ft., an nda greater conformity at 
low altitudes than at high elevations. Thus, the mean prc 
ili i mean 
I txts ‘been n making extensive hy vale ge in - ravine near roe 
bamba, and have taken out over a hundred fossil bones,—a 
ey were evidently washed down from ‘another place, as we sel- 
on we ee eg Coal beds; by Dr. F. V. Hayven. on a 
letter to J. D. Dana, dated Cheyenne City, Dakota Ty., Oct. 
Sst, 1867.) 
My g Seitpanane during the past summer convinced me that 
there is no probability that any workable beds of coal will ever be 
found within the limits of ane state of N aber The future profs 
Westward to Colorado and Dakot ta. I first made an examination of 
the li of the Rocky Mountains, 
on the Laramie plains, and there I found an , excellent quality of Lig- 
nite in beds from : to 11 feet thick. Rock Creek, a branch of the 
edicine Bow river, forms very nearly the eastern limit of this in- 
terior basin, and it "extends Ba Boiaci nearly to Great Salt Lake. 
T have estimated the are occupied by these noe beds at 5,000 
Square miles. The Uni acti railroad tly thro rough 
them, and iby next eeaon cake ey 0a n be brow, ht into the market. 
in Colorado. Passing over Laramie ra range of monniaitli, 
by the, pe stage route, the first coal mines opened are at South 
Ider Creek. These mines are called the Marshall mines, and 
are robably, the most valuable in the west. By means of the dip 
of the strata we find here exposed the finest section I have seen. 
eves beds of ignite te, from 5 to 13 feet in thickness, are revealed, _ 
making at lone 30 ie feet of solid lignite. Dr. Toreey. nade - 
