SANDSTONES. 
247 
The following- bedded sandstones of the same region are also 
described : 
F. From middle fork of Cottonwood, 1 mile above Miller's. 
G. Top of cascade, 1£ miles up Byron Creek from north fork of 
Cottonwood. 
H. Two and one-half miles above John Allen's, Dry ('reek. 
Analyses F and G by Chatard, record No. 1106; H by Whitfield, 
record No. 974. 
Si0 2 . . 
A1A- 
Fe 2 3 . 
FeO.. 
MgO . 
CaO.. 
K 2 
H 2 at redness. 
TiO, • 
PA 
MnO 
BaO 
C0 2 
so 3 
CI 
55.85 
13.20 
2.56 
4.77 
1.90 
6.93 
2.60 
1.89 
1.13 
2.99 
.76 
.18 
.24 
iindet. 
4.97 
99.97 
67.62 
13.63 
1.25 
3.27 
2.34 
2.80 
2.78 
1.11 
.64 
2. 83 
.48 
.08 
.15 
.03 
99.73 
ii. 
60.74 
10.25 
4.31 
6.2] 
3. 69 
4.97 
1.83 
.52 
4.36 
.86 
trace 
trace 
2.29 
.40 
trace 
100. 43 
3. SANDSTONE FROM SULPHUR BANK. 
Described by Becker in Mon. XIII, p. 92. Analysis made by Melville 
in the San Francisco laboratory. An altered sandstone, showing grains 
of quartz, plagioclase, and orthoclase. 
Si0 2 . 
A1A 
FeA 
FeO. 
MgO 
CaO. 
Na 2 
K 9 0. 
68.50 
12.82 
1. 29 
3.37 
2.21 
1.82 
6. 03 
1.26 
H 2 Oatl00°... 
H 2 above 100 
Ti0 2 
PA 
MnO 
.28 
2. 11 
.60 
.16 
.02 
100. 4: 
