Descriptive Catalogue of a Petrographic Span Classsearchtermspan Classse
Descriptive Catalogue of a Petrographic Span Classsearchtermspan Classse
Robert Watson Clark
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Ref. J. S. Newberry. Report of the Geological Survey of Ohio, Vol. II. Part I. Page 88. MACROSCOPIC : Light gray, fine grained sandstone showing fine parallel bedding lines. MICROSCOPIC : Clastic texture. It consists of subangular grains of quartz, orthoclase, plagioclase and microcline together with a few flakes of muscovite, small grains of zircon, pyrite and leucoxene. The cement is often obscured by dusty opaque material but is composed of calcite in part and of argillaceous material in whi...ch sericite shreds and small quartz grains may be recognized. No. 63. Banded Sandstone Near Buffalo Gap, South Dakota. Ref. N. H. Barton. U. S. Geological Survey 21st Annual Report, Part IV. Page 489. MACROSCOPIC : Reddish, even granular rock showing fine bedding lines. MICROSCOPIC : Clastic texture. The rock consists of subangular grains of quartz with an argillaceous and ferruginous cement. There are a few grains of zircon and tourmaline. No. 64. Brownstone Portland, Connecticut. Ref. W. N. Rice.
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