SANDSTONES, CHERTS, AND SINTERS. 187 
. SILICEOUS SINTERS. 
From the Yellowstone National Park and similar localities. Analyses 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. (oH D. E. 
93.37 | 93.88 
1.16 1.73 
trace 14 
05 07 
29 +25 
ll - 28 
02 23 
4.17 3.37 
- 08 18 
231 - 20 
COP geNit..s aavecemates aecamemeeunes enet weouigt seeceeenens eeeete 2B | wederecan 
Ay OF SATU Cy ee cees vaca acs bt SAS Sees bh eenigamenat SeaesaeretSe BE Peas OY | deheniare aus ee sl eenteadleceseees 
100. 41 | 100.33 | 100.02 | 99.92 100. 09 
Analyses F to O, 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. Whitfield. 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. 
M. Same as L, top layer, sintery. 
N. Incrustation, platform near Union Geyser. 
O. Black coating, the ‘‘Minute Man,’’ Norris Basin. 
aIncludes H of organic matter. b Whether as S or SO3 was not determined. 
