298 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
SILICEOUS SINTERS. 
From the Yellowstone National Park and similar localities. Analy- 
ses A to E by J. E. Whitfield, record Nos. 97, 100, 707, 708, and 861. 
Discussed by Weed in 9th Ann., p. 619. 
A. Dried siliceous jelly from Emerald Spring, Upper Basin. 
B. Sinter from Solitary Spring, Upper Basin. 
C. Grayish sinter from margin of Splendid Geyser. 
D. Compact sinter from Old Faithful Geyser. 
E. From Asta Spring, Hillside Group. Sp. gr., 1.7122. 
A. 
B. 
C. 
I). 
E. 
Si0 2 
Al 2 O s 
93. 37 
1.16 
trace 
.05 
.29 
.-11 
. 02 
4.17 
.08 
.31 
.78 
.07 
93.88 
1 . 7:5 
.14 
.07 
. 25 
.28 
.23 
3. 37 
.18 
.20 
81.95 
6.49 
trace 
.15 
.56 
2.56 
.65 
7.50 
trace 
.16 
89. 54 
2.12 
trace 
trace 
1.71 
1.12 
.30 
5. 13 
trace 
trace 
89. 72 
| 1.02 
Fe 9 0, 
MgO - 
CaO 
trace 
2.01 
Na 2 
K 2 
H 2 0(ign.) 
NaCl 
7.34 
S0 3 
trace 
C, organic 
H, organic 
100. 41 
100. 33 
100. 02 
99.92 
100. 09 
Analyses F to O, hitherto unpublished, are all of Yellowstone Park 
deposits. Record Nos. 236, 703, 697, 706, 698, 709, 812, 866, and 
1012. Analysis N by T. M. Chatard; all the others by J. E. Whit- 
field. Samples collected by W. H. Weed. 
F. Geyserite incrustation, Spring No. 8, Giant Group, Upper 
Basin. 
G. Incrustation from margin of crater, Surprise Geyser. 
H. Deposits from Coral Spring, Norris Basin. 
I. Sediment, Vixen Geyser. 
J. Deposit from Artemisia Geyser. 
K. Opal deposit, Norris Basin. 
L. Incrustation, Excelsior Geyser Basin. Bottom layer, compact, 
opaline. 
