258 
ANALYSES OF EOCKS, U. S. GEOLOGICAL SURVEY. 
[BULL. 168. 
TENNESSEE, ALABAMA, LOUISIANA. 
A. Limestone, Knoxville, Tennessee. Analysis by L. G. Eakins, 
record No. 1159. 
B. Knox dolomite, Morrisville, Alabama. Described by Russell in 
Bull. 52, together with a residual clay derived from it. See section 
on clays. Analysis by W. F. Hillebrand, record No. 797. 
C. Limestone from Rayborn's salt-lick, Bienville Parish, Louisiana. 
Analysis b}^ R. B. Riggs, record No. 323. 
D. White marble, streaked with black. From 5 miles west of 
Winnfield, Louisiana. Analysis by W. F. Hillebrand, record No. 760. 
In addition to the constituents named in the table, this marble con- 
tains traces of barium, strontium, chlorine, and organic matter. 
A. 
B. 
C. 
D. 
Insoluble 
. 65 
Si0 2 
.17 
.04 
.23 
3.24 
.17 
.17 
.06 
.55 
\ 1.61 
ALO, 
trace 
Fe,0, 
FeO . 
trace 
.10 
55.01 
60 
.13 
MnO 
trace 
54.09 
.06 
CaO 
55. 47 
.30 
.21 
29.58 
20.84 
.30 
MgO 
H 2 • 
P 2 5 
.05 
44.12 
.05 
co 2 
43.63 
45.54 
43.43 
.27 
SOg 
100.05 
99:90 
100. 53 
100. 19 
