'KEL.l 
PENNSYLVANIA. 
281 
COMPOSITION. 
Analyses of Helderberg limestone, Pennsylvania. a 
No. 
Silica 
(Si0 2 ). 
2.50 
3.00 
.3.02 
1.80 
1.62 
10.85 
1.69 
5.70 
2.33 
5.04 
5.30 
49.03 
21. 68 
15. 72 
6.53 
2.85 
7.86 
11.93 
4.25 
3.92 
7.65 
3.02 
4.26 
20.24 
3.61 
5.94 
Alumina 
(A1 2 3 ); 
Iron oxide 
(Fe 2 3 ). 
0.84 
.64 
.57 
.80 
.65 
.58 
.44 
1.77 
.70 
1.14 
1.78 
1.67 
4.66 
2. 55 
1. 21 
.70 
2.11 
1. 36 
.84 
.68 
.71 
.54 
1.10 
2.97 
1.11 
1.26 
Lime car- 
bonate 
(CaC0 3 ). 
95.66 
95. 09 
95. 57 
95.25 
96. 16 
84.78 
96.14 
90.90 
94. 03 
91.12 
89.29 
47. 30 
70. 59 
71. 73 
89.64 
94.28 
87.93 
82. 73 
93. 27 
93. 87 
88.82 
94. 28 
92.20 
73.43 
90.18 
89. 39 
Magnesium 
carbonate 
(MgC0 3 ). 
1.55 
1.58 
1.52 
2.27 
1.59 
3.86 
1.60 
2.16 
1.97 
1.57 
2.56 
2.01 
1.74 
7. 62 
1.82 
1. 53 
1.94 
2. 83 
1.38 
1.31 
2.34 
2. 12 
2.17 
2.65 
4.31 
3.25 
Sulphur 
(S). 
0.10 
.03 
.03 
. 05 
.07 
.05 
.05 
.08 
.06 
.03 
.06 
.15 
. 03 
n. el.- 
n. .1. 
.06 
.23 
.70 
.11 
.15 
.21 
.21 
.15 
n. (1. 
.25 
97 
a From Reports Ml, M2, M3, Second Geol. Survey Pennsylvania. A. S. McCreath, analyst. 
I, 2, 3. Baker quarry, Altoona, Blair County. 
4. Creswell quarry, Hollidaysburg, Blair County. 
5. Manning quarry, Hollidaysburg, Blair County. 
6. Loop quarry, Hollidaysburg, Blair County. 
7. Sarah furnace, Blair County. 
8. 9, 10. Hudson quarry, Three Springs, Huntingdon County. 
II, 12. McCarthy quarry, 'Sal tillo, Huntingdon County. 
13. Jersey Shore, Lycoming County. 
14, 15. Still quarry, 2 miles northeast Montebello Narrows, Perrv County. 
16-17. Bossardville, Hamilton Township, Monroe County. 
18-21. Van Auken quarry, Middle Smithfleld Township, Monroe County. 
22-23. Brown quarry, Smithfleld Township, Monroe County. 
24. Experiment Mills quarry, near Delaware Water Gap, Monroe County. 
25-26. Poxono Island, Monroe County. 
A deposit of limestone near Kings Rock, on Susquehanna River 
in Lycoming Count}^ belonging to this series, is described by Mr. 
Uriah Cummings in the Seventeenth Annual Report of the United 
States Geological Survey, part 3, pages 889-890. He states that 
