Water-Supply Paper Volume 319-320

Water-Supply Paper Volume 319-320

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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. 1913 edition. Excerpt: ...A large part of the surface deposits of Duval County consists of gray sands of Pleistocene age. These sands are underlain by red, yellow, and mottled sands and sandy clays which have been referred to the Lafayette (?) formation and regarded as Pliocene, though in the absence of fossils their exact age can be inferred only from their relations to the underlying and overlying formations. A great thickness of limestones, shales, and sands, lying beneath the sands and clays of Pleistocene and Pliocene age, belongs to the Jacksonville formation. The type locality of this formation is at Jacksonville, where it was encountered in digging a basin at the city waterworks. The log of the Jacksonville well (p. 124) shows the general character of the formation and indicates that it may have a thickness of at least 461 feet. The Hawthorn formation may be represented by beds of clay and limestone, but there is some doubt as to its presence in the Jacksonville well; toward the south and west it is extensively developed and it not improbably extends into Duval County. The entire county is underlain by the Vicksburgian limestones, but they are so deeply buried that their presence can be detected only in artesian-well drillings. The Pleistocene gray sand is comparatively thin, probably in few places exceeding 30 feet and averaging not more than 20 feet. The underlying red, yellow, and variegated sands of Pliocene age may in some localities be 30 or 40 feet thick. At Jacksonville their thickness appears to be about 20 feet. The thickness of the Jacksonville formation may be nearly 500 feet, though from the conditions at St. Augustine ft is inferred that it thins toward the south. The Hawthorn formation is apparently thin. The Vicksburgian limestones have...show more

Product details

  • Paperback | 256 pages
  • 189 x 246 x 14mm | 463g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123699163X
  • 9781236991638