228 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
F. From Red Creek canyon, southern part of Colorado Springs quadrangle. 
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, rec- 
ord No. 1578. FeO, represents total iron. Al,0, includes TiO,. In I the ignition 
includes some CO,, which is absent from the others. 
13 32 73 
34 42 1,24 
none - 03 08 
25 - 56 48 
3.78 | 11.80 10.50 
05 - 06 07 
100. 21 | 100.38 | 100.36 | 100.43 
J to R. Supposed fire clays collected in the area of the Apishapa sheet, by G. K. 
Gilbert. Analyses, partial, by H. N. Stokes, record No. 1503. Titanium present, 
alkalies undetermined. Analyses made on ignited material, reckoned as 100. The 
loss on ignition is separately stated below each analysis. 
26 32 09 10. eeecness 21 05 45 
Bb eoe sels 71 19 32 21 26 64 1.08 
S. Loesslike alluvium, Golden, Jefferson County. 
T. Fire clay, Golden, Jefferson County. 
Analyses S and T made by W. F. Hillebrand in the Denver laboratory. 
s T. 
SiO, 72.31 50. 35 
AlO3..- 12. 66 34. 44 
Fe203. -. 4.67 75 
MgoO.... 94 trace 
CaO 1,15: |psneeaee 
NaO... 2.47 -10 
K20 3.75 +48 
H.O +organic matter 1.80 13. 88 
DBs iatcta cota rai zieca:siahehaveieectanaicssesesniens Siaisio vere eminem ielaioiae s MRSA aiwiolem as HGR cea seReesIeS oS 2d: Il smscaes 
' 
99.98 | 100.00 
