SLATES AND SHALES. 
281 
NEW YORK. 
Roofing slates from Washington County, collected by T. Nelson 
Dale. Of Cambrian age. Described by Dale in 19th Ann., Part III. 
A. Red, three-fourths mile south of Hampton Village. 
B. Empire Red Slate Company, near Granville. 
C. National Red Slate Company, Granville. 
D. Green, three-fourths mile northwest of Janesville. 
Analyses by W. F. Hillebrand, record No. 1567. 
Si0 2 
A1A 
Fe 2 3 
FeO 
MgO 
CaO 
Na^O 
K 2 
H 2 0at 110°.... 
H 2 above 110° 
Ti0 2 
PA 
MnO 
BaO 
C0 2 
FeS 2 
100. 00 
67.61 
67.55 
13.20 
12.59 
5.36 
5.61 
1.20 
1.24 
3.20 
3.27 
.11 
..26 
.67 
.61 
4.45 
4.13 
.45 
.40 
2.97 
3. 03 
.56 
.58 
.05 
.10 
.10 
.19 
.04 
.31 
none 
.11 
.03 
.04 
100. 02 
56.49 
11.59 
3.48 
1.42 
6.43 
5. 11 
.52 
3.77 
.37 
2.82 
.48 
.09 
.30 
.06 
f.42 
.03 
100. 38 
67.89 
11.03 
1.47 
3.81 
4.57 
1.43 
.77 
2.82 
.36 
3.21 
.49 
.10 
.16 
.04 
1.89 
.04 
100. 08 
All contain traces of lithia, of sulphates, and of nickel or cobalt. No carbonaceous 
matter is present. 
