Congressional Edition Volume . 4504

Congressional Edition Volume . 4504

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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. 1902 edition. Excerpt: his notes the probable occurrence of the Eureka quartzite. At Stampede Gap the range, with the exception of some very low foothills at the western base, which will be referred to later as probably Devonian or Silurian, is composed of about 800 feet of mingled limestone and slate overlain by about 1,400 feet of massive limestone containing siliceous beds. Some of these upper limestones carry indistinct and indeterminable organic remains. A mottled structure, seeming to indicate the former presence of coral remains in the now altered rock, is common, being the same struct ure as observed in the Cambrian rocks of the Schell Creek Range, described above as occurring about 30 miles south of Piermont. In the limestones at both localit ies metamorphism has caused the same peculiar pitted appearance which results from the segregation of metamorphic minerals. In the Highland Range, about 4 miles south of Stampede Gap and about the same distance southwest from Pioche, the entire range appears to be of Cambrian strata, and Mr. Walcott" has measured the following section: Section in Highland Range J, miles south of Stampede Gap. Feet. 1. Quartzite 850 2. Limestone and shales, argillaceous and arenaceous 1,450 3. Massive limestone II. 000 Total 4,800 The fossils which he collected at various points correlated this section with the Cambrian at Eureka, the basal quartzite corresponding to the Prospect Mountain quartzite. In the Highland Range, south of Bennetts Spring, the writer has noted the probable continuation of the Cambrian section for a distance of 5 or 0 miles at the very least, the section being substantially the same as between Bennetts Spring and Stampede Gap. From the eastern base of the Highland Range abundant quantities of more

Product details

  • Paperback | 264 pages
  • 189 x 246 x 14mm | 476g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236646754
  • 9781236646750