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Two large meteorite impacts at the Cretaceous–Paleogene boundary

Jolley, D . W.; Gilmour, I.; Gurov, E.; Kelley, S. P. and Watson, J. (2010). Two large meteorite impacts at the Cretaceous–Paleogene boundary. Geology, 38(9) pp. 835–838.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1130/G31034.1
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Abstract

The end Cretaceous mass extinction has been attributed to a single asteroid impact at Chicxulub on the Yucatan peninsula, Mexico. The discovery of a second smaller crater at Boltysh in the Ukraine with a similar age has raised the possibility that a shower of asteroids or comets impacted Earth close to the K/Pg boundary. Here we present palynological and del13C evidence from crater fill sediments in the Boltysh impact crater. Our analyses demonstrate that a post-impact flora formed on the ejecta layer, was in turn devastated by the K/Pg events. The sequence of floral recovery from the K/Pg event is directly comparable with that in mid North America. We conclude that the Boltysh crater pre-dated Chicxulub by approximately 2ky - 5ky a timescale that constrains the likely origin of the bodies that formed the two known K/Pg craters.

Item Type: Journal Article
Copyright Holders: 2010 The Geological Society of America
ISSN: 0091-7613
Academic Unit/Department: Science > Physical Sciences
Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 22382
Depositing User: Simon Kelley
Date Deposited: 22 Jul 2010 14:09
Last Modified: 28 Aug 2013 08:26
URI: http://oro.open.ac.uk/id/eprint/22382
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