Home > Proterozoic Impact Craters: Keurusselk, Sudbury Basin, Acraman Crater, Vredefort Crater, Saarijrvi Crater, Liverpool Crater, Lawn Hill Crater(English)
Proterozoic Impact Craters: Keurusselk, Sudbury Basin, Acraman Crater, Vredefort Crater, Saarijrvi Crater, Liverpool Crater, Lawn Hill Crater(English)

Proterozoic Impact Craters: Keurusselk, Sudbury Basin, Acraman Crater, Vredefort Crater, Saarijrvi Crater, Liverpool Crater, Lawn Hill Crater(English)

          
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About the Book

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Keurusselk, Sudbury Basin, Acraman Crater, Vredefort Crater, Saarijrvi Crater, Liverpool Crater, Lawn Hill Crater, Suvasvesi, Shoemaker Crater, Holleford Crater, Foelsche Crater, Strangways Crater, Iso-Naakkima, Spider Crater, Lumparn, Yarrabubba Crater, Amelia Creek Crater, Goyder Crater, Sksjrvi, Suavjrvi Crater, Kelly West Crater, Sderfjrden, Beaverhead Crater, Calvin Crater, Dhala Crater. Excerpt: Acraman crater is a deeply eroded impact crater in the Gawler Ranges of South Australia . Its location is marked by Lake Acraman, a circular ephemeral playa lake about 20 km in diameter. The discovery of the crater and independent discovery of its ejecta were first reported in the journal Science in 1986. The evidence for impact includes the presence of shatter cones and shocked quartz in shattered bedrock on islands within Lake Acraman. The crater is deeply eroded and its original size must be inferred by indirect means. Some authors estimate an original diameter of up to 85 90 km, while other suggest a smaller size, perhaps only 35 40 km, closer to that of the depression in which Lake Acraman is centred. The larger size estimate would imply an energy release of 5.2 10 megatons of TNT . The impact event is estimated to have occurred about 580 million years ago during the Ediacaran Period; this age is not derived from the crater itself but from the position of ejecta within nearby sedimentary basins . Landsat image of Lake Acraman; screen capture from NASA World Wind . Oblique Landsat image of Lake Acraman drapped over digital elevation model (10x vertical exaggeration), looking east towards the Flinders Ranges where ejecta has been found; screen capture from NASA World Wind. Acraman lake (circle, just lower right of center), is ringed by Lake Gairdner and others, outli...


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Product Details
  • ISBN-13: 9781155639574
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 70
  • Series Title: English
  • Sub Title: Keurusselk, Sudbury Basin, Acraman Crater, Vredefort Crater, Saarijrvi Crater, Liverpool Crater, Lawn Hill Crater
  • Width: 229 mm
  • ISBN-10: 115563957X
  • Publisher Date: 06 May 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 4 mm
  • Weight: 113 gr


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