CLAYS AND MARLS, 
357 
Hudson, and exerts an important influence upon the agriculture of these vallies. It is an 
excellent base for agricultural work, and makes a desirable foundation for tillage. 
A reddish brick clay appears on Cayuga lake, and is probably the same clay which 
exists in Christian-hollow. 
The Adirondack clay is local, and is formed by the decomposition of the hypersthene 
rock. 
COMPOSITION OF THE CLAYS OF NEW-YORK. 
PLACES AND KINDS OF CLAY. 
Silex. 
Alumina 
and iron. 
Carbonate 
of lime. 
Magnesia. 
Phosphates 
Potash. 
Water, loss 
and organic 
| matter. 
Tertiary or Albany clay.'... 
52-44 
32-28 
8-00 
trace.* 
trace. 
trace. 
5-28 
Niagara clay... 
58-24 
20-76 
14-62 
2-42 
. • 
0-44 
3-24 
Cayuga clay .... 
44-20 
28-72 
16-48 
0-16 
trace. 
trace. 
8-44 
Adirondack clay. 
84-63 
0-94 
0-60 
trace. 
0-11 
6-52 
Brick clay near Caldwell. 
65-60 
17-52 
8-92 
0-39 
6-68 
Reddish clay of Christian hollow,f 
44-84 
27-40 
8-29 
1-36 
2-60 
16-36 
* A preceding analysis gave 1-62. 
[ Common 
n the Wheat district. 
COMPOSITION OF THE NEW-YORK MARLS. 
PLACES. 
Carbonate 
of lime. 
Oxide of iron 
and alumina. 
Organic 
matter. 
Insoluble 
matter. 
Water. 
Magnesia. 
Saratoga county. 
85-62 
1-24 
3-92 
3-40 
2-32 
3-80 
Fairmount: near Mr. Geddes’, 
21-24 
Salem: Mr. Crary’s farm. 
81-22 
1-24 
6-51 
2-42 
7-25 
trace. 
Christian-hollow . 
75-45 
0-62 
0-52 
0-56 
22-24 
0-62 
Cavuga bridge*. 
22-20 
8-88 
3-00 
41-75 
4-88 
19-30 
* Formed by decomposing plaster shales. 
