208 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
YELLOWSTONE NATIONAL PARK. 
Travertines described by W. H. Weed in 9th Ann., p. 619. 
A. Terrace below the hotel. 
B. Cupids Cave. 
C. Near Sulphur Spring No. 246, Mammoth Hot Springs. 
D. Extinct spring, main terrace, Mammoth Hot Springs. 
E. Ridge behind main terrace. 
Analysis C by F. A. Gooch, record No. 243; A, B, D, and E by 
J. E. Whitfield, record Nos. 240, 242, 244, 245. 
A. 
B. 
c. 
D. 
E. 
Si0 2 
.08 
.15 
.15 
.49 
.01 
| .05 
55.02 
.07 
.04 
.06 
.14 
.26 
.11 
ALOo 
Fe 2 3 
CaO 
53. 83 
.90 
53. 41 
.42 
.01 
.03 
2.44 
.13 
55.02 
.06 
54.06 
.66 
MgO 
K 2 
Na 2 
H 2 
1.43 
.02 
1.61 
.12 
1.06 
.20 
.08 
.70 
42. 25 
.24 
1.19 
.26 
NaCl 
KC1 
so 3 
1.72 
41.79 
.21 
.55 
41.96 
.37 
.49 
42.25 
.11 
1.34 
42.14 
none 
co 2 
C (organic) 
100. 13 
99.96 
99.77 
99.81 
100. 02 
