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Home > Art, Film & Photography > Maars of Oregon: Fort Rock, Fort Rock Basin, Diamond Craters, Hole-In-The-Ground, Big Hole, Blue Lake Crater
Maars of Oregon: Fort Rock, Fort Rock Basin, Diamond Craters, Hole-In-The-Ground, Big Hole, Blue Lake Crater

Maars of Oregon: Fort Rock, Fort Rock Basin, Diamond Craters, Hole-In-The-Ground, Big Hole, Blue Lake Crater


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About the Book

Chapters: Fort Rock, Fort Rock Basin, Diamond Craters, Hole-In-The-Ground, Big Hole, Blue Lake Crater. Source: Wikipedia. Pages: 26. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Fort Rock - Fort Rock was created when basalt magma rose to the surface and encountered the wet muds of a lake bottom. Powered by a jet of steam, molten basalt was blown into the air, creating a fountain of hot lava particles and frothy ash. The pieces and blobs of hot lava and ash rained down around the vent and formed a saucer-shaped ring of lapilli tuff and volcanic ash sitting like an island in the lake waters. Steam explosions also loosened angular chunks of black and red lava rock comprising the valley floor. These are thought to be similar to if not continuous with Picture Gorge Basalt flows of the John Day country. These blocky inclusions are incorporated into the fine-grained tuff layers at Fort Rock. Waves from the lake waters eroded the outside of the ring, cutting the steep cliffs into terraces 66 feet (20 m) above the floor of Fort Rock Valley. The wave-cut terraces on the south side of the ring mark former lake levels of this now-dry lakebed. Southerly winds, which are still predominant in this region, apparently drove waves against the south side of the ring, eroding the soft ash layers, breaching it, and creating a large opening on the south side. Fort Rock looking east from the Fort Rock Road Winter view looking northwest into open sidePrevious age estimates of Fort Rock ranged upwards to 1.8 million years. Recently, the age of Fort Rock has been estimated at 50,000 to 100,000 years. This coincides with a period of time when large pluvial lakes filled the valleys of central Oregon and much of the Great Basin of the western United States. At its maximum, the water in Fort Rock Lake was estimate...More: http: //booksllc.net/?id=4562531


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Product Details
  • ISBN-13: 9781158630530
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Fort Rock, Fort Rock Basin, Diamond Craters, Hole-In-The-Ground, Big Hole, Blue Lake Crater
  • Width: 229 mm
  • ISBN-10: 1158630530
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 2 mm
  • Weight: 54 gr


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