Aug
28
2010

T-rex could run, but he couldn't hide: More than one asteroid impact may have wiped out non-avian dinosaurs.
T-rex could run, but he couldn't hide: More than one asteroid impact may have wiped out non-avian dinosaurs.Courtesy Mark Ryan
The meteor that created the Chicxulub Crater in Mexico's Yucatan Peninsula may have not been the only one responsible for the extinction of non-avian dinosaurs 65 million years ago. "Fern spike" evidence in another similarly-aged crater found in the Ukraine indicates at least two large impacts took place within a few thousand years of each other. Concentrations of fern spores are commonly found in the mud that fills in impact craters. The Boltysh Crater contains two layers of spores within three feet of each other, indicating not one but two impacts.

"We interpret this second layer as the aftermath of the Chicxulub impact", said Simon Kelley, co-author of the study, and professor of Isotope Geochemistry at the Open University.

Both the Chicxulub and Boltysh bolide events could have been part of a meteor shower that hit Earth at the end of the Cretaceous. The study appears in the journal Geology.

SOURCE and INFO LINKS
BBC story
The K-T Extinction event

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