East Warburton Basin

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.