. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. )oth muscovite and a greenish PLATE VI, PLATE VI. IHOTOMICKOGKAlHS OF ROCK SECTIONS. A.—IiiduratiMl arkose conglomerate from near contact witli overlying sheet ofanterior Southwestern shoulder of Pine Hill, Soiitli Britain. (No. 4n3a.)Ordinary light. Magnified 2o diameters. The most striking evidence of the induration is fomid in the enlargement of thequartz fragments. B.—Fragmental bituminous limestone from Ked Spri
. Annual Reports of the Department of the Interior for the Fiscal Year Ended June 30, 1900--Twenty-First Annual Report of the United States Geological Society. )oth muscovite and a greenish PLATE VI, PLATE VI. IHOTOMICKOGKAlHS OF ROCK SECTIONS. A.—IiiduratiMl arkose conglomerate from near contact witli overlying sheet ofanterior Southwestern shoulder of Pine Hill, Soiitli Britain. (No. 4n3a.)Ordinary light. Magnified 2o diameters. The most striking evidence of the induration is fomid in the enlargement of thequartz fragments. B.—Fragmental bituminous limestone from Ked Spring. Ordinary light. Mag-nified 25 diameters.()2 U. S. GEOLOGICAL SURVEY TWENTY-FIRST ANNUAL REPORT PART III PL. VI. fA) INDURATED ARKOSE CONGLOMERATE.(Ji) FRAGMENTAL BITUMINOUS LIMESTONE, THE HtLIOTYPE PRINTING CO. BOSTON SOUTH BRITAIN ARKOSE CONGLOMERATE. 63 Garnet and tourmaline are abundant, in generall}- broken crystals,except when they are entirely inclosed within quartz grains. Therock is notably free from cementing material, the grains interlockingtogether to produce in the hand specimen a somewhat miarolitic struc-ture. By reason of their deep-brown color the shale pebbles areprominent features in the slide. Some are so fine in grain as to reveallittle save their uniform brown color. In a few others which have acoarser texture angular fragments of quartz, feldspar, muscovite, andbiotite are made out, showing that they are, as regards their composi-tion, practically identical with the mass of the rock. As regards theirshape, they are angular, showing no evidence of abrasion of edges andangles. Contact effects in this formation.—While the arkose described fromthe fault near Oliver Mitchells
Size: 1210px × 2065px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1900, bookyear1901
