306 ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
VIRGINIA AND WEST VIRGINIA. 
A. Limestone, upper ledge, Moundsville Narrows, West Virginia. 
B. Same as A, lower ledge. Analysis A and B by T. M. Chatard, 
record No. 127. 
C. Trenton limestone, Lexington, Virginia. Analysis by R. B. 
Rigg.s, record No. 365. 
D. Limestone, Staunton, Virginia. Analysis by George Steiger, 
record No. 1630. 
E. Part of D insoluble in one-tenth hydrochloric acid. 
F. Soluble part of D. Analyses E and F, also by Steiger, same num- 
ber. These three analyses are accompanied by analyses of the residual 
clay, formed by the weathering of the limestone. See section on clays. 
Insoluble. 
SiO, 
Tin, 
A1A---- 
Fe 2 3 ... 
FeO 
MnO 
ChO. 
MgO 
K 9 0. 
A. 
10.83 
90 
trace 
48.02 
1.08 
1.53 
96 
-14 
42 
trace 
58.26 
H 2 Oat 100°... 
H 2 above 100 c 
PA 
CO., 
.05 
trace 
39.18 
99. 
.10 
trace 
43.10 
99. 94 
54. 77 
trace 
1. 08 
42. 72 
99. 4:; 
7.37 
.09 
1.92 
.29 
.63 
none 
28.39 
18.30 
1.09 
. 09 
.09 
.49 
.03 
41. 85 
100. 63 
6.98 
.09 
1.39 
.25 
none 
none 
.04 
.15 
.91 
.04 
undet. 
.15 
none 
none 
10.00 
.39 
none 
.53 
.04 
.63 
none 
28. 35 
18.15 
.18 
.05 
undet. 
.34 
.03 
41.85 
5)0. 54 
