Abstract
Analyses of leaf megafossil and dispersed leaf cuticle assemblages indicate that major ecologic disruption and high rates of extinction occurred in plant communities at the Cretaceous-Tertiary boundary in the Raton Basin. In diversity increase, the early Paleocene vegetational sequence mimics normal short-term ecologic succession, but on a far longer time scale. No difference can be detected between latest Cretaceous and early Paleocene temperatures, but precipitation markedly increased at the boundary. Higher survival rate of deciduous versus evergreen taxa supports occurrence of a brief cold interval (<1 year), as predicted in models of an “impact winter.”
Keywords: paleobotany, quasisuccession, extinction, “impact winter”
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Selected References
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- Bohor B. F., Foord E. E., Modreski P. J., Triplehorn D. M. Mineralogic evidence for an impact event at the cretaceous-tertiary boundary. Science. 1984 May 25;224(4651):867–869. doi: 10.1126/science.224.4651.867. [DOI] [PubMed] [Google Scholar]
- Ehrlich P. R., Harte J., Harwell M. A., Raven P. H., Sagan C., Woodwell G. M., Berry J., Ayensu E. S., Ehrlich A. H., Eisner T. Long-term biological consequences of nuclear war. Science. 1983 Dec 23;222(4630):1293–1300. doi: 10.1126/science.6658451. [DOI] [PubMed] [Google Scholar]
- Hunt S. W., 3rd, Hoffee P. A. Increased adenosine deaminase synthesis and messenger RNA activity in deoxycoformycin-resistant cells. J Biol Chem. 1983 Jan 10;258(1):41–44. [PubMed] [Google Scholar]
- Pillmore C. L., Tschudy R. H., Orth C. J., Gilmore J. S., Knight J. D. Geologic framework of nonmarine cretaceous-tertiary boundary sites, raton basin, new Mexico and colorado. Science. 1984 Mar 16;223(4641):1180–1183. doi: 10.1126/science.223.4641.1180. [DOI] [PubMed] [Google Scholar]
- Tschudy R. H., Pillmore C. L., Orth C. J., Gilmore J. S., Knight J. D. Disruption of the terrestrial plant ecosystem at the cretaceous-tertiary boundary, Western interior. Science. 1984 Sep 7;225(4666):1030–1032. doi: 10.1126/science.225.4666.1030. [DOI] [PubMed] [Google Scholar]