Mineral Resources of Alaska; Report on Progress of Investigations in 1908. Prince William Sound, Kenai Peninsula, Southwestern Alaska

Mineral Resources of Alaska; Report on Progress of Investigations in 1908. Prince William Sound, Kenai Peninsula, Southwestern Alaska

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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. 1909 edition. Excerpt: ...was several times just below sea level, probably near to shore, and at other times above sea level, receiving wash from higher lands, or overgrown by dense growths of vegetation. Miocene sediments appear in Unga and Popof islands and at several places on the north and south sides of Alaska Peninsula. They consist of sandstones, shales, and conglomerates that represent ofishore, shallow-water deposition. An abundance of fossil material was procured and has been identified by Mr. Dall. At Coal Harbor, Unga Island, the Miocene strata conformably overlie the Kenai formation (upper Eocene), but at other localities the Miocene sediments appear to rest unconformably upon different formations and to have been restricted to local basins. They are but little disturbed. One collection of-fossil plants, from the Herendeen Bay district but from a lithologic unit that occupies a very small area, seems to indicate post-Miocene age. The most extensive post-Miocene formations consist of volcanictuffs and basic lava flows. They are widespread on the mainland in the vicinity of the Balboa-Herendeen Bay district, and cover many square miles in the islands to the south and in the region about Chignik Bay. Much of the volcanic material just described may be of Pleistocene or even post-Pleistocene age, and there is little doubt that some of it is. Glacial drift mantles the lowlands on the north side of the Alaska Peninsula and is irregularly distributed in the mountain valleys. Since Pleistocene time the land has risen, relative to sea level, and the terraces bordering the coast are covered with Recent alluvium. In the valley bottoms and at the heads of bays there are other alluvial deposits of post-Pleistocene age. DISTRIBUTION OF KNOWN MINERAL DEPOSITS....show more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236818199
  • 9781236818195