254 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[BULL. 168. 
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. 
Riggs, 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. 
A. 
B. 
c. 
D. 
E. 
P. 
Insoluble 
Si0 2 
Ti0 2 ... 
10. 33 
1.53 
.44 
7.37 
.09 
L.92 
29 
• .63 
none 
28. 39 
18. 30 
1.09 
.09 
. 09 
.49 
.03 
41. 85 
6. 98 
.09 
1.39 
.25 
none 
none 
.04 
.15 
. 91 
.04 
undet, 
.15 
none 
none 
.39 
none 
.53 
.04 
.63 
none 
28. 35 
18.15 
.18 
.05 
undet. 
.34 
.03 
41. 85 
ALOo 
Fe 2 3 
FeO 
.90 
.96 
.42 
MnO 
GaO 
MgO 
K 2 
trace 
48.02 
1.08 
trace 
53. 26 
.93 
54.77 
trace 
Na 2 
H 2 at 100° . . . 
H 2 above 100° 
P 2 5 
| . 05 
trace 
39.18 
} •» 
trace 
43.16 
} 1.08 
C0 2 
42.72 
99.56 ' 
99. 94 
99.43 
100. 63 ! 10. 00 
90. 54 
