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10 June, 22:05

What evidence is preserved to indicate that a large meteorite impact occurred at the end of the Mesozoic?

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  1. 10 June, 23:37
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    High concentrations of iridium, of extraterrestrial origin, shocked quartz, evidence of fire, tsunami deposits, a fern spore spike, indicating colonization of disturbed landscapes by ferns, and the large Chicxulub impact structure in the Yucatan, dated to c 65 mya--about the same time as the end of the Mesozoic.
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