!L. | 
NEW YORK. 
249 
3. Keenan Lime Company, Smith's Basin, Washington County. II. Ries, analy 
4. Harris quarry, near Whitehall, Washington County. Ibid. 
;">. Glens Palls, Warren County. .J. H. Appleton, analyst. Seventeenth Ann. 
urvev, pt. 3, p. 801. 
(J. Glens Falls, Warren County. Mineral Industry, vol. fi, p. 97. 
7. Glens Falls, Warren County. Bull. New York State Mus. No. 44, p. 825. 
8. Hewitt quarry, Amsterdam, Montgomery County. Ibid., p. 749. 
9. Hewitt quarry, Amsterdam, Montgomery County. J. M. Sherrerd, analyst 
,ept. U. S. Geol. Siirvey, pt, 6, p. 427. 
10. Hewitt quarry, Amsterdam, Montgomery County. J. M. Sherrerd, analyst. 
11. Hewitt quarry, Amsterdam, Montgomery County. J. M. Sherrerd, analyst. 
12. Butler quarry, Ingham Mills, Herkimer County. * Bull. New York State Mus. 
13. Butler quarry, Ingham Mills, Herkimer County. Ibid. 
14. Prospect, Oneida County. J. D. Irving, analyst. Ibid., p 802. 
15. Waters quarry, Lowville, Lewis County. Ibid., p. 792. 
16. Roberts quarry, Collinsville, Lewis County. I). H. Newland, analyst, Ibid., 
17. Christy quarry. Leyden, Lewis County. Ibid., p. 791. 
18. Snyder quarry, Port Leyden, Lewis County. D. H. Newland, analyst, Ibid., 
st, Ibid., 
P- 
827. 
Kept. 
U. 
S 
Geol 
. Twenti 
■tl 
Ann 
Ibid., 
Ibid., 
No. 11 
PI 
P1 
f>, p. 427 
6, p. 427 
788. 
p. 791. 
p. 791 
1IELDER B ER G L TMES TONES. 
DISTRIBUTION. 
I Regarded as possible sources of Portland-cement materials, the most 
Important series of limestone formations in New York State is that 
Included in the Upper and Lower Helderberg groups. These two 
Jroups, each divisible into a number of well-marked formations, are 
leparated throughout the greater part of their range by a compara- 
tively thin bed of sandstone — the Oriskany sandstone — but for the 
lurposes of this volume may be considered as one series of limestones, 
[the Helderberg limestones, considered together, extend eastward from 
[Buffalo, in Erie County, to Oriskany Falls, Oneida County. Here 
[the belt turns about S. 30° E., nearly to South Bethlehem, Albany 
County. From this point the outcrops of the limestone trend almost 
[parallel to and a little west of Hudson River, nearly to Kingston. The 
limestone belt then turns southeastward, passing through Ellenville 
jtnd Port Jervis into Pennsylvania and New Jersey. The line of out- 
pop is show 7 n in considerable detail in PI. X. 
The distribution of the Helderberg limestones is described at length 
[n the following papers, in which maps and sections showing local 
details will be found: 
Darton, N. H. Report on the Helderberg limestones: Thirteenth Ann. Rept. 
kew York State Geol., pp. 197-228. 
Darton, N. H. Report on the Geology of Albany County: Thirteenth Ann. 
^ept. New York State Geol., pp. 229-262. 
j Darton, N. H. Report on the Geology of Ulster County: Thirteenth Ann. 
Rept. New York State Geol., pp. 289-372. 
COMPOSITION. 
Analyses of Helderberg limestones, New York. 
" 
Silica 
(Si0 2 ). 
Alumina 
(A1 2 3 ). 
Iron oxide 
(Fe 2 3 ). 
Lime 
(CaO). 
Magnesia 
(MgO). 
Carbon di- 
oxide (C0 2 ). 
11 
1.17 
5.00 
5.96 
14.85 
o 
64 
54. 06 
51.78 
41). 70 
40. 23 
0. 48 
.88 
1.44 
1.95 
43 00 
12 
no 
41 66 
3 
4 
3.16 
7.18 
1.34 
1.57 
40. 13 
33. 76 
