CHERT. From the lead-zinc region of southwestern Missouri and its extension into Kansas. Collected by W. P. Jenney. A. Unaltered chert, East Hollow, Belleville, Jasper County, Missouri. B. Partly altered, same locality. C. Altered to "cotton rock," same locality. D. From the Surprise mine, Joplin, Missouri. E. Blue chert, unaltered, Bonanza shaft, Galena, Kansas. Analyses E, F, and G by E. A. Schneider, record No. 1205; H and I by L. G. Eakins, record No. 1208. 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. Analyses F to O, hitherto unpublished, are all of Yellowstone Park deposits.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. 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. opaline. Bottom layer, compact, M. Same as L, top layer, sintery. N. Incrustation, platform near Union Geyser. O. Black coating, the "Minute Man," Norris Basin. The following foreign sinters were analyzed for comparison with the Yellowstone Park specimens: P, Q, R. Three samples of sinter from Rotorua, New Zealand. Analyses by J. E. Whitfield, record No. 998. Discussed by Weed in 9th Ann., p. 619. S. Sinter from Mount Morgan gold mine, Queensland. Described by Weed in Am. Journ. Sci., 3d series, vol. 42, p. 165. Analysis by E. A. Schneider, record No. 1254. THE CARBONATE ROCKS: LIMESTONE, DOLOMITE, VERMONT. A. White marble, Rutland. Analysis by L. G. Eakins, record No. 1213. B. The portion of A insoluble in dilute hydrochloric acid. Same analyst and number. C. Dolomite, Green Peak quarry, Dorset. Analysis by George Steiger, record No. 1938. Described by Dale in Bull. 195. |