Document Detail

A tropical rainforest in Colorado 1.4 million years after the Cretaceous-Tertiary boundary.
MedLine Citation:
PMID:  12089439     Owner:  NLM     Status:  MEDLINE    
An extremely diverse lower Paleocene (64.1 million years ago) fossil leaf site from Castle Rock, Colorado, contains fossil litter that is similar to the litter of extant equatorial rainforests. The presence of a high-diversity tropical rainforest is unexpected, because other Paleocene floras are species-poor, a feature generally attributed to the Cretaceous-Tertiary (K-T) extinction. The site occurs on the margin of the Denver Basin in synorogenic sedimentary rocks associated with the rise of the Laramide Front Range. Orographic conditions caused by local topography, combined with equable climate, appear to have allowed for the establishment of rainforests within 1.4 million years of the K-T boundary.
Kirk R Johnson; Beth Ellis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  296     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2002 Jun 
Date Detail:
Created Date:  2002-06-28     Completed Date:  2002-07-23     Revised Date:  2007-03-19    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2379-83     Citation Subset:  IM    
Department of Earth Sciences, Denver Museum of Nature & Science, Denver, CO 80205, USA.
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MeSH Terms
Geologic Sediments
Plant Leaves* / anatomy & histology
Plants* / anatomy & histology,  classification
Trees* / classification
Tropical Climate*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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