Jolley, D . W.; Gilmour, I.; Gurov, E.; Kelley, S. P. and Watson, J.
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|DOI (Digital Object Identifier) Link:||http://dx.doi.org/doi:10.1130/G31034.1|
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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|
|Academic Unit/Department:||Science > Physical Sciences|
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Simon Kelley|
|Date Deposited:||22 Jul 2010 14:09|
|Last Modified:||25 Nov 2012 03:42|
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