In recent research published by myself and my colleague Tony Yeates in the journal Tectonophysics, we investigate what we believe - based on many years of experience in asteroid impact research - is the world’s largest known impact structure, buried deep in the earth in southern New South Wales.

The Australian continent and its predecessor continent, Gondwana, have been the target of numerous asteroid impacts.

These have resulted in at least 38 confirmed and 43 potential impact structures, ranging from relatively small craters to large and completely buried structures.

The Deniliquin structure has all the features that would be expected from a large-scale impact structure.

Acknowledgment: I’d like to thank my colleague Tony Yeates, who originated the view of the Deniliquin multi-ring structure as an impact structure - and who was instrumental to this work.