The Minerals of Tonopah, Nevada

The Minerals of Tonopah, Nevada

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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. 1914 edition. Excerpt: ...from the lower Miocene of Kern River, Kern County, California. It is believed to be characteristic of middle and lower Miocene. The number of species comprising the fauna of the Monterey is very limited; some of them, however, are confined to a small vertical range and serve definitely to place the beds within middle and lower Miocene. CORRELATION WITH THE MONTEREY MIOCENE OF CONTRA COSTA COUNTY Miocene strata, supposed to be of the same age as the Monterey, occur along the east shore of San Pablo Bay and in the vicinity of Mount Diablo. One of the largest and most important of these areas extends from San Pablo Bay southeast toward the town of Walnut Creek. The strata have been folded into a broad syncline whose axis strikes approximately N. 50 W. Along the northern border of the syncline, near Selby Smelter, the beds lie unconformably upon a dark shale which is considered to be of lower Eocene age. Along their" southern boundary they rest in part, presumably, upon the Tejon formation, of upper Eocene age. The San Pablo beds lie upon this series. At Selby the section is composed of brownish-gray sandstone and rusty, yellowish shale. The strata are inclined toward the southwest at a high angle. In a few localities they are standing almost vertical. The thickness is between three and four thousand feet. The south side of the syncline is composed of both sandstone and shale. The shale in the lower portion is composed of a white, well-stratified rock which resembles very closely the shale at Monterey. The shale occurring in the upper part of the section is more argillaceous and of a rusty-yellow color. The sandstone is principally a gray, medium-grained rock. The dip of the strata is toward the northeast at angles varying between thirty and...
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Product details

  • Paperback | 100 pages
  • 189 x 246 x 5mm | 195g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236493338
  • 9781236493330