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Bulletin Volume 683

Bulletin Volume 683


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: volcanic activity occurred even spasmodically throughout the period between the times of extravasation of the oldest and youngest lavas. More probably in each locality volcanic activity was confined to a relatively short period and therefore was not exactly synchronous with the activity at other centers. Criteria are lacking at most of the localities to determine the time at which the lavas were extruded, and it is only possible to say that although they may have been extruded in late Cretaceous, Tertiary, or Quaternary time it appears probable that most of them are late Tertiary or early Quaternary. GEOLOGIC HISTORY. Too many facts are missing to permit the writing of the complete geologic history of this region. Fossils give only a single point of reference upon which an outline may be drawn, and all other historical data must be obtained from lithologic relations, from the structure, and from the amount of metamorphism of the rocks within the region, or, if these facts are lacking, by correlation with formations outside the region. Nevertheless, an attempt is here made to summarize such points as are known or may be surmised from the studies that have been made in this and near-by parts of Alaska. PALEOZOIC TIME. Nothing is known of the history of this region prior to late Carboniferous time. At that time at least a portion of the region was a land surface upon which flows were poured out, while in the near-by marine basins were laid down deposits consisting largely of tuffs, which in places alternate with conglomerates, sandstones, and even argillitic rocks. These deposits afford an indication of the changing relations of land and sea areas while sedimentation was going on. In other portions of Alaska1 a crustal movement took place at the beginning of the Per...


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Product Details
  • ISBN-13: 9781459052468
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1459052463
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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