SANDSTONES FROM CALIFORNIA. 1. SANDSTONES FROM MOUNT DIABLO. Described by Turner and Melville in Bull. Geol. Soc. Amer., vol. 2, pp. 383-414. Analyses made by W. H. Melville in the San Francisco laboratory. A. Upper Cretaceous, Chico sandstone. Light brown, finely granular, carrying grains of mica and feldspar. B. Lower Cretaceous, Neocomian sandstone. Hard, granular, greenish. From head waters of Bagley Creek. C. Miocene sandstone. Granular, particles light brown and black, friable. From near Wall Point. D. Chico sandstone. Greenish gray, compact, crystalline. Traces of organic matter are found in all four sandstones, but were not determined. 2. SANDSTONE DIKES IN SHASTA COUNTY. Described by J. S. Diller in Bull. Geol. Soc. Amer., vol. 1, p. 411. The rock is made up of quartz, feldspar, and biotite, with a calcite cement. Serpentine, sphene, magnetite, and zircon also occur in it, but are less common. A. From Salt Creek, one half mile above McNett's. B. One and one-fourth miles below Ono Bridge, north fork of Cottonwood. C, D. Three-fourths of a mile below John Allen's, Dry Creek. Analyses A and B by T. M. Chatard, record No. 1106; C, D, and E by J. E. Whitfield, record Nos. 972, 973. The following bedded sandstones of the same region are also described: F. From middle fork of Cottonwood, 1 mile above Miller's. G. Top of cascade, 14 miles up Byron Creek from north fork of Cottonwood. H. Two and one-half miles above John Allen's, Dry Creek. Analyses F and G by Chatard, record No. 1106; H by Whitfield, record No. 974. 3. SANDSTONE FROM SULPHUR BANK. Described by Becker in Mon. XIII, p. 92. Analysis made by Melville in the San Francisco laboratory. An altered sandstone, showing grains of quartz, plagioclase, and orthoclase. MISCELLANEOUS SANDSTONES. A. Triassic sandstone from the Jaittelle quarry, near Hancock, Maryland. Hard, compact, brown. Analysis by F. W. Clarke, record No. 613. B. Brown sandstone, Hummelstown, Pennsylvania. Analysis by E. A. Schneider, record No. 1280. Described by Diller in Bull. 150, p. 77. P. R. C. 14. C. Yellow sandstone from Stony Point, Michigan. Analysis by F. W. Clarke, record No. 213. D. Carboniferous sandstone adjoining the peridotite dike of Elliott County, Kentucky. See Diller, Amer. Journ. Sci., 3d series, vol. 32, p. 125. Analysis by T. M. Chatard, record No. 354. E. Yellow sandstone, Armejo quarry, Colorado. Analysis, partial, by T. M. Chatard, record No. 289. F. Potsdam sandstone, Ablemans, Sauk County, Wisconsin. Described by Diller in Bull. 150, p. 80. Analysis by Schneider, record No. 1280. P. R. C. 15. G. Banded sandstone, Peoa, Utah. Described by Diller in Bull. 150, p. 80. Analysis by Schneider, record No. 1280. P. R. C. 16. H. Brown sandstone, Flagstaff, Arizona. Analysis by T. M. Chatard, record No. 1144. I. Sandstone, Robinson mine, Summit County, Colorado. Analysis by L. G. Eakins, made in the Denver laboratory, partial. |
