270 
ANALYSES OF ROCKS, U. S, GEOLOGICAL SURVEY 
[BULL. 36^ 
COLORADO. 
1. DENVER BASIN. 
Rocks described by Emmons in Mon. XXVII. 
L. G. Eakins, in the Denver laboratory. 
A. Upper Wyoming limestone, Morrison. 
B. Niobrara dolomite. 
Analyses made h\ 
A. 
B. 
Insoluble 
5.32 
.53 
.38 
.49 
48.73 
2.95 
.11 
.03 
41.71 
12.01 
.54 
.11 
.20 
27.49 
18.03 
.61 
.03 
41.40 
A1 2 3 
Fe 2 3 
MnO 
CaO 
MgO 
H 2 
P 9 0. 
co 2 
100. 25 
100. 42 
