Geologic and biostratigraphic framework of the non-marine Cretaceous-Tertiary boundary interval in western North America
Review of Palaeobotany and Palynology
By: D. J. Nichols
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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.
| 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 |
| Google Analytic Metrics | Metrics page |