Congressional Serial Set Volume 5309

Congressional Serial Set Volume 5309

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...below top. Exposed in slope to river, 71 Section of Niobrara limestone and Pierre shale on Bazile Creek at bend in road t mile south of Bazile Point, Ncbr. Pierre shale: Feet. Carbonaceous clay, dark in bank, lighter on weathered surface, which is strewn with selenite crystals and small yellowish concretions of irregular form 6 Niobrara: Weathered chalk, yellowish, with 3 or 4 light-colored streaks 2 inches thick and about 1 foot apart, O. eongesla present 7 Chalk, beds irregular, sandy, and at places concretionary; gypsum plates occur in bedding and irregular joint planes. Lower beds t! to 8 Inches thick. O. congesta is the common fossil "8i Blue chalk, lower 4 feet in 2 beds; large Inoeerami and O. congesta present 8 The Pierre shale is the thickest member of the Cretaceous in Nebraska, varying in thickness from a few feet in northwestern Cedar County to over 500 feet in western Boyd County. The base, lying on the Niobrara, slopes down slowly from western Cedar County to central Knox County, beyond which it is either horizontal or has a slight rise'westward. The eroded top reaches an altitude of over 1,900 feet in western Boyd County. At the cement works, 4 miles west of Yankton, S. Dak., the Pierre clay just above the Niobrara chalk is distinctly crumpled, a feature which may have been caused by the ice sheet. During Eocene and early Miocene times this region was a land area eroded into hills and valleys. The Pierre clay was entirely removed in the eastern part, and on the rough upper surface later Tertiary and Quaternary deposits were laid down, to be themselves in turn partly removed by weathering and erosion. The Pierre shale is commonly called "gumbo" and "soapstone," and consists principally of dark and bluish, ...
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Product details

  • Paperback | 228 pages
  • 189 x 246 x 12mm | 413g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236552423
  • 9781236552426