Acraman crater

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1. 1Acraman Crater

   Welcome to the heart of the Gawler Ranges in South Australia, a landscape that serves as a profound testament to the violent celestial history of our planet. As we stand here, we are looking at the remnants of one of the most…

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2. 2The Gawler Ranges Volcanics — A 1.6 Billion Year Foundation

   To understand the Acraman impact, we must first examine the stage upon which it occurred. The ground beneath us is part of the Gawler Ranges Volcanics, a massive province of volcanic rock that formed approximately 1.6 billion…

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3. 3The Central Lake — Remnants of the Impact Eye

   We have now moved closer to the actual salt lake of Acraman, which represents the degraded center of the impact structure. From this perspective, the lake appears as a flat, innocuous saltwater basin, but magnetic surveys reveal…

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4. 4Shatter Cones and Shocked Quartz — The Smoking Gun

   As we examine the outcropping rocks near the lake's edge, we are looking for the 'smoking gun' of the impact: shatter cones and shocked quartz. These features are entirely extraterrestrial in their requirement for formation; the…

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5. 5The Ejecta Layer — A 300 Kilometer Flight

   One of the most extraordinary aspects of the Acraman event is the distance to which it threw its 'calling cards.' While we are standing at the impact site, some of the best evidence for the scale of this disaster is found 300…

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6. 6Biological Impact — The Acritarch Crisis

   While we often think of mass extinctions in terms of dinosaurs, the Acraman impact had a profound effect on the microscopic life of the Ediacaran period. At the time of the impact, 580 million years ago, the dominant life forms…

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7. 7The Magnetic Anomaly and Volcanic Neighbors

   As we conclude our structural overview, we must look at the hidden architecture of the crater revealed through modern technology. Under magnetics, the center of Lake Acraman shows a very distinct protrusion. …

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8. 8Closing

   As we stand at the final waypoint of our journey through the Acraman crater, it is impossible not to feel a sense of humility. We have traversed a landscape that was shaped in seconds by a force greater than any human endeavor,…

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