Bulletin Volume 575-579

Bulletin Volume 575-579

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...done mainly with plane table over the topographic base prepared by Albert Pike during the preceding summer. The accompanying map (PL VI) is a reproduction on a smaller scale of the field map with portions of the original detail omitted. Only a partial survey of the township has been made by the General Land Office, but a theoretical net has been projected over the remainder of the township for convenience in reference.. STRATIGRAPHY. The rocks of this township range in age from Carboniferous to Pliocene or Pleistocene and include both sedimentary and igneous types. The various formations are fully considered on pages 14-33 of this report, but a brief description of them is given here, together with an account of their distribution. The Carboniferous rocks include upper Mississippian limestone, the Wells formation (Pennsylvanian), and the Phosphoria formation (Permian?). The Madison limestone has not been observed. The rocks below the Phosphoria formation were not differentiated in the field, but it is probable that most if not all of them should be assigned to the sandy limestones and quartzitcs of the Wells formation. They occupy most of the southeastern part of the township and underlie most of sees. 1, 12, 13, 30, 31, and 32, and a strip along the west border of tho township. The topmost part of the formation, which underlies the phosphate beds (the underlying limestone of the report for 1910), is well developed in many places and forms fine cliffs in sees. 16 and 18. The Phosphoria formation underlies the valley just east of the ridge that extends from sec. 32 to sec. 19. It also spreads around a lower intervening ridgo and appears on the west side of Slug Valley from sec. 28 to sec. 17. Farther north it appears in a belt extending...show more

Product details

  • Paperback | 116 pages
  • 189 x 246 x 6mm | 222g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236971892
  • 9781236971890