248 
CEMENT MATERIALS AND INDUSTRY, 
[BULL. 243. 
counties, along the valleys of West Canada Creek and Black River. 
Commencing as a narrow belt near Middleville, Herkimer County, it. 
passes northwestward, increasing to about 8 to 10 miles in width, and 
going through Trenton Falls, Prospect, Remsen, Boonville, Port Lev den, 
Lowville, and Copenhagen, at many of which points it is extensively 
quarried. The limestone belt here widens out greatly, being about 20 
miles wide at Watertown, and extending along the St. Lawrence-Lake 
Ontario shore from near Clayton to near Port Ontario, a distance of 
over 50 miles. Within this broad area in Jefferson County the Tren- 
ton limestones are quarried at Cape Vincent, Chaumont, Clayton, 
Watertown, Theresa, and man} T other points. 
COMPOSITION. 
The Trenton limestone is usually a pure nonmagnesian limestone. 
It is dark gray to almost black in color, and is commonly highly fos- 
siliferous. 
The following analyses, which are representative of the various* 
phases of the Trenton limestone, are arranged in geographical order' 
along the outcrop of that limestone, beginning in Washington County,, 
on the east, and ending in Lewis County, on the west. 
Analyses of Trenton limestones, New York. 
Number. 
1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
10. 
11. 
12. 
13. 
14. 
15. 
16. 
17. 
18. 
Silica 
(Si0 2 ). 
0.97 
1.38 
.72 
.70 
2.13 
3.30 
1.10 
6.13 
1.25 
3.82 
5.68 
6.70 
8.45 
2.59 
3.96 
3.09 
1.44 
6.50 
Alumina 
(A 1,0,). 
Iron oxide 
(Fe 2 3 ). 
0.08 
0.58 
1.50 
1.00 | 
1.26 
1.30 
.80 
.79 
3.00 
1.08 
2.76 
3.03 
2.72 
1.21 
1. 
1. 15 
1.6/ 
83 
0.02 
Lime(CaO) 
.-50 
.61 
.21 
.84 
.61 
.49 
.76 
54.15 
55.26 
54.28 
53. 09 
53. 19 
52.15 
53. 17 
49. 55 
52. 78 
52. 46 
52.12 
49.92 
47. 38 
52.00 
51.11 
52. 70 
54. 52 
49.53 
Magnesia 
(MgO). 
0.39 
.72 
.80 
1.04 
Trace. 
1.58 
.75 
1.17 
Trace. 
1.63 
1.04 
1.80 
.78 
.49 
1.28 
Carbon dio; 
ide (COo). 
42. 9{ 
n. d. 
44. 0< 
42. 
41. ?j 
40. 9 
45. 
40.28 
42. 9 | 
42.6 
39.4 
39.2 
39. C 
42. ( 
42.1 
42 J 
43. i 
40. 'i 
1. Keenan Lime Company, Smith's Basin, Washington County. Twentieth Ann. Rept. U. S. Ge< 
Survey, pt. 6, p. 127. 
2. Keenan Lime Company, Smith's Basin, Washington County. Bull. New York State Mus. No. \ 
p. 826. 
