East Warburton Basin
The state of South Australia. Warburton Basin would be at the NE corner.
The East Warburton Basin in South Australia is the site of a large impact crater of the Carboniferous period (around 360-300 million years ago). The subterranean structure lies buried at a depth of ~4 km, and measures a minimum of 200 km in diameter. For comparison, Chicxulub crater is about 180 km in diameter.
Scientists identified the impact formation through analysis of shocked quartz grains from the area after a circular anomaly appeared in seismic tomography studies of the region.
List of unconfirmed impact craters on Earth
Coordinates: 28°00′S 140°30′E / 28°S 140.5°E / -28; 140.5
^ Vast asteroid impact zone found in Australia AFP/Google News, 19 February 2013. Accessed 15 May 2013.
^ Geophysical anomalies and quartz microstructures, Eastern Warburton Basin, North-east South Australia: Tectonic or impact shock metamorphic origin? Tectonophysics Vol. 589, 18 March 2013, Pp. 57–76. Accessed 15 May 2013.
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