Rocky Mountain Trip 
El Mono at 2 in the morning. Our party consists of Dr. Hayden, 
Mr. Wilson, Mr. Atkinson, Mr. Reading and myself. Dr. H. Peale 
and I set to work to study the geologic section from the Divide 
to Colorado Springs, and they seem to be convinced that 1 was 
right in esteeming the Monument Creek group as separate from the 
Divide group and.that the interval between is filled with sands 
and marls - red, white and yellow - some 700 feet in thickness. 
civ 
Matched the sunset behind the Pikes Peak group and found camp 
in a corral, El Mono at 2 o’clock August 18th. 
Aug. 18th : El Moro. Thursday the outfit was packed and 
sent forward to the base of Fishers Peak. Dr. Hayden I rode 
westward to the duffs, three miles from El Moro. The strata 
crossed m die gradual, slope were about 800 feet of cretaceous 
shales, containing toward the top specimens of inoceramus bacu~ 
lites, etc. in concretions. About 200 feet followed these com¬ 
posed of alternate layers of sandstone and shales. The first 
escarpment of the bluffs is of a massive white sandstone, some¬ 
what, liregular, bedd.ed 150 to 180 ieet thick. Above this are 
about 200 feet of shales and coal bearing strata, then 40 or 50 
feet of sandstone, yellowish and firm. A 
higher ridge beyond 
