800 
ANALYSES OF TCOCKS, V. S. GEOLOGICAL SURVEY. 
[BUJLL.1G8. 
F. From Red Creek Canyon, south part Colorado Springs quad- 
rangle. 
G. From 2 miles southeast of F. 
H. From near Canyon. 
I. Overlying H. 
Collected as probable fire clays by G. K. Gilbert. Analyses by 
George Steiger, record No. 1578. Fe 2 3 represents total iron. A1 2 3 
includes Ti0 2 . In I, the ignition includes some C0 2 , which is absent 
from the others. 
Si0 2 .... 
A1 2 3 --- 
Fe 2 3 --- 
MgO... 
CaO..__ 
Na 2 0... 
K 2 0._.. 
Ignition 
PA— - 
F. 
G. 
85. 09 
86.79 
6.98 
8.29 
1.10 
.75 
.27 
.13 
.21 
.34 
none 
none 
.13 
.25 
6.37 
3.78 
.06 
.05 
100. 21 
100. 38 
B. 
57.98 
27. 51 
1.68 
.32 
.42 
.03 
.56 
11.80 
.06 
100. 36 
69.04 
14.51 
3.78 
.73 
1.24 
.08 
.48 
10.50 
.07 
100. 43 
