Though due to it’s location below the Antarctic ice sheet conclusive evidence has yet to be found, estimation from the ring size of the crater put it at as least twice as large as the Chicxulub crater associated with the demise of the dinosaurs. Scientist theorize that the force of the impact may have even been responsible for the break up of the southern super continent of Gondwanaland.
Note that there is no evidence bracketing the timing of that possible impact closer than between 500 million and 100 million years ago; and there is no evidence that it is responsible for the breakup of Gondwana. That is entirely speculation.
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