CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
169 
NEW MEXICO. 
1. BASALTS FROM RIO GRANDE CANYON. 
Described by Iddings, Bull. 66; also in Amer. Journ. Sci., 3d series, 
vol. 36, p. 220. Contain plagioclase, augite, olivine, and magnetite. 
A, B, and C contain quartz also; D is quartzless. Analyses by L. G. 
Eakins, record Nos. 847, 850. 
A. Light gray, dense. P. R. C. 548. 
B. Greenish black, dense. 
C. Dark red, vesicular. P. R. C. 549. 
D. Grav dense. P. R. C. 547. 
Si0 2 .. 
A1 2 3 . 
Fe 2 3 
FeO.. 
MgO. 
CaO.. 
Na,0. 
K 2 0. 
H 2 0. 
Ti0 2 . 
P 2 6 - 
MnO 
BaO. 
C0 2 .. 
CI... 
52.27 
17.68 
2.51 
5.00 
6.05 
8.39 
4.19 
1.58 
.82 
1.49 
.23 
.06 
trace 
trace 
100. 27 
B. 
52. 37 
17.01 
1.44 
5.89 
6.86 
7.59 
3.51 
1.59 
1.29 
1.60 
.32 
.06 
.37 
trace 
99.90 
51.57 
17.72 
6.24 
1.78 
4.91 
8.82 
3.59 
1.99 
.64 
1.43 
.45 
.16 
.58 
99.88 
52. 38 
18.79 
2.88 
4.90 
4. 91 
7.70 
3. 99 
1.76 
.53 
1.22 
.56 
.18 
.11 
99.91 
