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Disruption of the terrestrial plant ecosystem at the Cretaceous-Tertiary boundary, western interior

Science

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Abstract

The palynologically defined Cretaceous-Tertiary boundary in the western interior of North America occurs at the top of an iridium-rich clay layer. The boundary is characterized by the abrupt disappearance of certain pollen species, immediately followed by a pronounced, geologically brief change in the ratio of fern spores to angiosperm pollen. The occurrence of these changes at two widely separated sites implies continentwide disruption of the terrestrial ecosystem, probably caused by a major catastrophic event at the end of the period.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Disruption of the terrestrial plant ecosystem at the Cretaceous-Tertiary boundary, western interior
Series title:
Science
Volume
225
Issue:
4666
Year Published:
1984
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1030
Last page:
1032
Number of Pages:
3