LU(> 
CEMENT MATERIALS AND INDUSTRY. 
Lbull. 243. 
CHAZY LIMESTONE. 
DISTRIBUTION. 
The Chazy limestone is confined practically to the Lake Champlain 
Valley. It outcrops on the west shore of Lake Champlain, a fei 
miles south of Crown Point village, and is also well shown in Crown 
Point itself. It appears again on the lake shore about 5 miles south i 
of Westport, near Essex village, and on Willsboro Point. Its mostrii 
characteristic and extensive outcrops, however, are in the eastern 
part of Clinton County. It is shown well on Valcour Island and on 
Isle la Motte, where it has been extensive^ quarried. On the main- 
land it occupies large areas north of Valcour and west of Plattsburg.J 
where it is quarried. The largest single area is in the northeasterrJ 
part of Clinton County, where it has been worked extensively for lime 1 
and building stone. This area extends almost without a break f roir 
the village of West Chazy to the lake shore and northward to the«| 
Canadian line near Rouse Point. 
Local details concerning the distribution, thickness, etc., of th< 
Chazy formation will be found in a paper by H. P. dishing, entitled 
" Report on the Geology of Clinton County," in the Thirteenth Annua | 
Report of the New York State Geologist, pages 473-490. This pape] 
also contains geological maps of the county, showing the area coverea 
by the limestone. 
COMPOSITION. 
The Chazy limestone is usually a very pure limestone, low in hot 1 ,; 
magnesia and clayey matter. It is commonly bluish to grayish irj 
color, and has a slightly crystalline appearance. Occasionally it cai 
ries notable percentages of silica, alumina, etc., but these argillaceotji 
phases are rare. Of the analyses in the following table Nos. 1 and 
represent the purest type of the Chaz} T limestone, while Nos. 3, 5, an ( 
6 contain more or less cla}^ey matter. Analysis No. 4 is included aa 
representing a highly argillaceous type, occurring in the same area ai 
Nos. 3, 5, and 6; but this particular analysis is old and of doubtfi 
value. 
Analyses of Chazy limestone, New York. 
Silica (Si(),) 
Alumina ( A1 2 3 ) 
Iron oxide (Fe 2 3 ) . . . 
Lime (CaO) 
Magnesia (MgO) 
Carbon dioxide (C0 2 ) 
0.79 
.14 
.12 
54.36 
.67 
43.45 
0.72 
.39 
53. 90 
1.44 
43. 92 
.". 
2. 43 
.41 
51.00 
1.00 
n. d. 
21.39 
3. 61 
39. 37 
.52 
31.51 
4.40 
7.10 
3.50 
44. 35 
2.00 
37.05 
4.» 
4. 
1. 
49. 
39. 
1 . ( 'hazy, Clinton County. Kept. New York State Geologist for 1897. p. 433. 
2. Chazy Marble Lime Company, Clinton County. D. H. Newland, analyst. Bull. New York Sti 
Museum, No. 44, p. 7.V>. 
3. Willslxao Point, Essex County. T. G. White, analyst. Ibid., p. 782. 
4-6. Willsboro Point, Essex County. E. C. Boynton, analyst. Ibid., pp. 782, 783. 
