Contributions from the Geological Department of Columbia University Volume 25; V. 28

Contributions from the Geological Department of Columbia University Volume 25; V. 28

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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. 1919 edition. Excerpt: ...within the Champlain valley, and extended the detailed stratigraphic study of the lower members of the formations there so extensively developed. As above cited, the detailed stratigraphy of the Cambrian, especially in the northern part of the Champlain valley, has been published by Mr Walcott, while similar work has been done in subdividing the zones of the Calciferous and Chazy in the region by Messrs Brainerd and Seely. My endeavor has been to prepare a similar preliminary study of the detailed stratigraphy of the Birdseye, Black River, and Utica formations overlying the latter. The method of investigation employed was modeled on that developed by Professor H. S. Williams in his studies of the Devonian of western New York and which has been described elsewhere by the writerfir Each stratigraphic zone which differed in anywise from those adjoining it was analyzed, on a faunal basis, and kept separate through all subsequent laboratory examination. The mass of the detailed work as thus analyzed will be published in volume xiii of the Annals of the New York Academy of Sciences, and the present contribution is but a summary of results therein set forth. In some cases as many as 96 distinctive beds were recognized and differentiateti by reason of faunal or lithologic differences within the limits ofa section having a total thickness of less than 200 feet. From Fort Ticonderoga to the head of Missisquoi bay, lake Champlain is about 110 miles long, and its greatest width is 13 miles. The lower Cambrian is unknown on the western side of the lake, but on the eastern has a thickness of many thousand feet. 'l'he Calciferous has a thickness of possibly over l,200 feet, and the Chazy perhaps half that. Following this very considerable mass more

Product details

  • Paperback | 212 pages
  • 189 x 246 x 11mm | 386g
  • United States
  • English
  • black & white illustrations
  • 1236988280
  • 9781236988287