RT @DrFunkySpoon: Holy giant hole in the ground Batman! Very large (31 km) and very young (Pleistocene) impact crater discovered beneath th…
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RT @Egyptianpast: Evidence of cosmic impacts 12,900 years ago! What else could wipe out ALL the mammoths?@joerogan @MarkJackson873 @MattSib…
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@johnhawks I realize the current consensus is that Hiawatha impact crater is 57 years old. But after re-reading https://t.co/xmCxJWHbFE “Radiostratigraphy of Hiawatha Glacier” I remain unconvinced.