248 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [bull.IGS. 
MISCELLANEOUS SANDSTONES. 
A. Triassic sandstone from the Jaittelle quarry, near Hancock, 
Maryland. Hard, compact, brown. Analysis by F. W . Clarke, record 
No. 613. 
B. Brown sandstone, Hummelstown, Pennsylvania. Analysis by 
E. A. Schneider, record No. 1280. Described by Diller in Bull. 150, 
p. 77. P. R. C. 14. 
C. Yellow sandstone from Stony Point, Michigan. Analysis by 
F. W: Clarke, record No. 213. 
D. Carboniferous sandstone adjoining the peridotite dike of Elliott 
County, Kentucky. See Diller, Amer. Journ. Sci., 3d series, vol. 32, 
p. 125. Analysis by T. M. Chatard, record No. 351. 
E. Yellow sandstone, Armejo quarry, Colorado. Analysis, partial, 
by T. M. Chatard, record No. 289. 
Si0 2 
ALA 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 at 100° . . 
H 2 above 100 c 
TiO, 
MnO 
C0 2 . 
Insol. in HC1 
A. 
76.43 
17.78 
.92 
.84 
undet. 
undet. 
2.79 
trace 
98.76 
88.68 
B. 
88.13 
5.81 
1.77 
.31 
.53 
.20 
.06 
2.63 
.23 
.26 
99.93 
c. 
84.57 
5.90 
6.48 
68 
undet. 
undet. 
1.92 
99. 55 
91.87 
60.78 
10.54 
3.27 
1.59 
10.15 
1.41 
2.36 
.85 
2.32 
.03 
.09 
.10 
6.29 
99. 78 
E. 
81.27 
9.81 
1.44 
.42 
.44 
undet. 
undet, 
1.19 
94.57 
95. 54 
