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Geologic and biostratigraphic framework of the non-marine Cretaceous-Tertiary boundary interval in western North America

Review of Palaeobotany and Palynology

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DOI: 10.1016/0034-6667(90)90058-Q

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Abstract

Palynologically defined Cretaceous-Tertiary boundary sites in nonmarine rocks in western North America exhibit similar characteristics. All are marked by abrupt disappearance of the regional uppermost Cretaceous palynoflora at the level of an iridium anomaly; most also yeild shock-metamorphosed minerals. All are in coal-bearing, fluvial or paludal depositional settings, although the boundary horizon may be below, within, above, or at some stratigraphic distance from coal seams. At many sites the lowermost Tertiary beds contain assemblages overwhelmed by fern spores that, together with extinctions of some groups of angiosperms, are taken as evidence of regional devastation of terrestrial plant communities and subsequent recolonization by pioneer species. ?? 1990.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geologic and biostratigraphic framework of the non-marine Cretaceous-Tertiary boundary interval in western North America
Series title:
Review of Palaeobotany and Palynology
DOI:
10.1016/0034-6667(90)90058-Q
Volume
65
Issue:
1-4
Year Published:
1990
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Review of Palaeobotany and Palynology
First page:
75
Last page:
84