810 ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
KENTUCKY. 
|NO. 228. 
A. Lithographic stone, 1 mile from Brandenburg, Meade County, 
on the Ohio River. 
B. Typical lithographic stone from Solenhofen, Bavaria. Analyzed 
for comparison with A. Analyses by George Steiger, record No. 1894. 
Si0 2 1 
A1 2 3 , Fe 2 3 >Residue insoluble in HC1. 
CaO 
A1 2 3 
FeO 
MgO 
CaO 
Alkalies 
H 2 at 100° . . . 
H 2 above 100 c 
C0 2 
SO, 
3.15 
.45 
.09 
3.69 
.13 
.31 
6.75 
44.76 
.13 
.41 
.47 
43.06 
none 
99.71 
B. 
1.15 
.22 
trace 
1.37 
.23 
.26 
.56 
53.80 
.07 
.23 
.69 
42.69 
none 
99.90 
