Victor Gostin describes his work in Outback Australia, piecing together the various clues that led to his understanding of the enormous impact of the 5km asteroid at Lake Acraman, Eyre Peninsula, South Australia. He relates the fascinating story of how he and his colleagues discovered volcanic material in the Flinders Ranges and linked it with the impact into volcanic rocks at Lake Acraman, some 300 kilometres away.

His discovery was linked to a previous discovery by George Williams, now also at the University of Adelaide, that an impact scar at Lake Acraman was due to the impact of an ancient large asteroid.

Victor Gostin describes the process he went through to find that material found at both sites were similar in lithology, fracturing, and age, showing that the ejecta in the Flinders Ranges came from the Lake Acraman impact.

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