CLARKE.] 
CAKBONATE RUCKS. 
259 
TEXAS. 
Supposed cement rock, Uvalde quadrangle. Collected by T. Way 
land Vaughan. Analysis by W. F. Hillebrand, record No. 1T59. 
A, the rock; B, the part insoluble in dilute nitric acid. 
Si0 2 
Fe 2 3 , A1A - - 
CaO 
MgO 
co 2 
Insoluble 
NaCl, Mn, H 2 
.10 
.()«» 
40.82 
.18 
32.41 
25. 57 
.83 
100. 00 
Si0 2 .... 
A1A--- 
Fe 2 3 -- 
PA---- 
H 2 0.... 
Alkalies 
B. 
20. 80 
:;. 4 1 
1.14 
.19 
25. 57 
a By difference. 
OHIO. 
A, B, C, D. Trenton limestone from New Vienna. 
Partial analyses by F. W. Clarke and R. B. Riggs, record Nos. 729, 
730, 732. Iron and alumina are present in soluble form. 
A. 
B. 
C. 
D. 
Insoluble 
8.47 
47.16 
1.52 
36.20 
9.93 
49.04 
.58 
37. 64 
2.12 
51.18 
3.08 
42.04 
28.43 
23. 00 
12.90 
30. 82 
CaO 
MgO 
C0 2 
92.35 
97.19 
98. 42 " 
95.15 
E. Trenton limestone, Arcadia, Hancock County. 
F. Air-line Junction, Toledo. This sample contains a great deal of 
ferrous carbonate. 
G. Gas rock, St. Henry's well, Mercer County. 
H. Oil rock, Lima. 
All Trenton. Analyses, partial, by Clarke and Riggs, record Nos. 
729, 730. 
E. 
F. 
G. 
H. 
Insoluble 
CaO 
8.56 
47.17 
2.59 
38.54 
3.52 
30. 64 
18.05 
42.82 
2.27 
50. 34 
2.86 
40.96 
1.64 
32. 24 
17.36 
43.92 
MgO 
co 2 
96.86 
95. 03 
96. 43 
95.16 
