Sceince of dating events using ice
Proponents of a Younger Dryas impact now feel vindicated.
"I'd unequivocally predict that this crater is the same age as the Younger Dryas," says James Kennett, a marine geologist at the University of California, Santa Barbara, one of the idea's original boosters.
They are there as a vital part of a flowering plant’s life cycle.
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They were trying to explain a cooling event, more than 1000 years long, called the Younger Dryas, which began 12,800 years ago, as the last ice age was ending.
But Jay Melosh, an impact crater expert at Purdue University in West Lafayette, Indiana, doubts the strike was so recent.
Statistically, impacts the size of Hiawatha occur only every few million years, he says, and so the chance of one just 13,000 years ago is small.
Its official chemical symbol is Mg, and its atomic number is 12, which means that magnesium has 12 protons in it ...
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