304 ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
PENNSYLVANIA. 
A. Compact gray limestone, Greason. Described by Diller in Bull. 
150. Analysis by E. A. Schneider, record No. 1279. 
B. Limestone, quarry on south side of Jordan Creek, near Jordan 
Bridge. South Whitehall. 
C. Quartzose dolomite, same locality as B. 
D. Hydraulic limestone, Atlas Cement Company's quarry, White- 
hall. 
Analyses B, C, D, by W. F. Hillebrand, record No. 2016. Samples 
collected by T. N. Dale. 
A. 
11.07 
B. 
c. 
D. 
Insoluble .. 
Si0 2 
3.72 
1 .81 
3.17 
48. 95 
2.80 
1" 
17.87 
31. 68 
18.30 
A1 2 3 
6.11 
Fe 2 3 . 
| 1.85 
FeO 
MgO 
9.00 
39.26 
J 
2.13 
CaO 
36. 38 
Na 9 
.35 
K 2 
1.17 
H 2 at 105° 
,.,. 
.38 
H 9 above 105° 
1.91 
TiO, 
undet, 
41.58 
undet, 
undet, 
43. 62 
undet. 
trace 
.24 
CO., . . 
38.82 
28.96 
P.,0 5 
.16 
MnO 
. 14 
Li 2 
trace 
FeS 2 
.94 
Carbonaceous matter 
.75 
1.11 
99.08 
98.23 
96. 81 
100. 13 
