312 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
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. 
Insoluble 
CaO 
MgO .... 
co 2 
A. 
8.47 
47.16 
1.52 
36.20 
92.35 
B. 
9.93 
49.04 
.58 
37.64 
97.19 
2.12 
51. 18 
3.08 
42.04 
42 
D. 
28.43 
23.00 
12.90 
30.82 
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 
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 
CaO 
32.24 
Mg< ) 
17. 36 
CO, 
43.92 
96.86 
95. 03 
96. 43 
95.16 
