Palaeobotanical evidence for a June 'impact winter' at the Cretaceous/Tertiary boundary

Details Palaeobotanical evidence for a June 'impact winter' at the Cretaceous/Tertiary boundary Palaeobotanical evidence for a June 'impact winter' at the Cretaceous/Tertiary boundary

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.352..420w&link_type=abstract

Nature (ISSN 0028-0836), vol. 352, Aug. 1, 1991, p. 420-423.

Biology

15

Cold Weather, Cretaceous-Tertiary Boundary, Geobotany, Meteoritic Damage, Paleobiology, Abundance, Bolides, Fossils, Impact Damage, Winter

Scientific paper

Aquatic leaves in the K/T boundary section near Teapot Dome/Wyoming, preserve structural deformation that can be duplicated experimentally in extant aquatic leaves by freezing. Reproductive stages reached by the fossil aquatic plants at the time of death suggests that freezing took place in approximately early June. Both the existence of the structurally deformed plants and the high abundance of fern spores occur in a horizon containing sparse impact debris, but below the horizon containing abundant impact debris. It is suggested that the lower horizon represents debris and effects from a large, distant bolide impact, and the upper horizon represents a small, nearby bolide impact.

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