Geological Survey Bulletin Volume 1395

Geological Survey Bulletin Volume 1395

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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. Excerpt: ... Sandstone Member, both of Temblor. Agua Sandstone Member of Temblor occurs as discontinuous lenses within Santos. (Dibblee, 1973.) Includes Eureka Tuff, now reduced in rank to its Eureka Member. Sapinero Mesa Tuff now considered same as uppermost of four unnamed ash-flow sheets of Gilpin Peak Tuff (abandoned). (Lipman and others, 1973.) Scoville Point Flow adopted as porphyrite flow, last of 12 named flows within Portage Lake Volcanics on Isle Royale. (Huber, 1973.) Shaktolik Group abandoned; its formations, Kaltag, Melozi, and Nulato, remain in good usage and are not assigned to another named group. (Patton, 1973.) Revision and reference Shawnee Group geographically extended into Nebraska. This does not include any or all formations or members of Shawnee accepted elsewhere. (Burchett and others, 1972.) Assigned to Windermere Group as lowermost of its three formations in northeastern part of belt. Overlies Belt Supergroup and correlative rocks; underlies Leola Volcanics of Windermere. Correlates with informal lower conglomerate member of Huckleberry Formation of Windermere in southwestern part of belt and with Toby Conglomerate of Windermere System (Canadian terms) northward in British Columbia, Canada. Age changed from Precambrian to Precambrian Y. (Miller and others, 1973.) No longer included in Potosi Volcanic Group (abandoned). (Lipman and others, 1973.) Silverton Volcanic Group abandoned; formerly included (ascending): Picayune Formation, Eureka Tuff, Burns Formation, and Henson Formation (none of which is now included in any named group). (Lipman and others, 1973.) Silvies Member of Dickinson and Vigrass (1965) adopted as one of four members of Snowshoe Formation in Izee area. Intertongues with unnamed middle member; overlies and underlies...
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Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236770447
  • 9781236770448