From Science Alert: "Strange Glass in Australia Reveals a Massive Impact We Never Knew About". They believe this was from a "giant impact" from about 11 million years ago, but no impact crater has been identified. Also:
The desert across southern Australia is positively strewn with tiny beads of impact glass called tektites. It's part of a region known as the Australasian strewnfield, the fallout created by a giant meteorite impact thought to have hit somewhere in Southeast Asia around 788,000 years ago.
Not surprised.
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