clarke.] IGNEOUS AND CRYSTALLINE ROCKS. 193 
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. All andose. 
A. Light gray, dense. P. R. C. 548. 
B. Greenish black, dense. 
C. Dark red, vesicular. P. R. C. 549. 
D. Gray, dense. P. R, C. 547. 
Si0 2 .. 
A1A- 
FeA. 
FeO.. 
MgO . 
CaO.. 
K 2 ( ) . 
H 2 0. 
Ti0 2 . 
P 2 5 . 
MnO 
BaO. 
A. 
52. 27 
17. 68 
2.51 
5.00 
6.05 
8.39 
4.19 
1.58 
.82 
1.49 
.23 
.06 
C0 2 i trace 
CI 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 
D. 
45 
16 
58 
99. ss 
52. 38 
18.79 
2.88 
4.90 
4.91 
7.70 
3.99 
1.76 
.53 
1.22 
.56 
.18 
- .11 
99. 91 
Bull. 228—04- 
-13 
