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GEOREF RECORD

Major extinctions of land-dwelling vertebrates at the Cretaceous-Tertiary boundary, eastern Montana

Peter M. Sheehan and David E. Fastovsky
Major extinctions of land-dwelling vertebrates at the Cretaceous-Tertiary boundary, eastern Montana
Geology (Boulder) (June 1992) 20 (6): 556-560

Abstract

A large database recording species of terrestrial vertebrates present in formations above and below the Cretaceous-Tertiary (K-T) boundary in eastern Montana was assembled by J. D. Archibald and L. J. Bryant. Division of the species in this database into freshwater and land-dwelling vertebrate assemblages reveals that the K-T vertebrate extinction was concentrated in land- dwelling forms. In data corrected for the effects of rare taxa, 90% of the species in the freshwater assemblage survived into the Tertiary, but only 12% of the land-dwelling forms survived. The pattern of differential extinction of terrestrial vertebrates in eastern Montana may be in large part the result of the dependence of land-based communities on primary productivity. This is in contrast to the riverine communities, which may derive much of their organic carbon from detritus. The pattern of extinction and survival is compatible with the hypothesis of an asteroid impact after which there was a temporary cessation of primary, photosynthetic productivity.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 20
Serial Issue: 6
Title: Major extinctions of land-dwelling vertebrates at the Cretaceous-Tertiary boundary, eastern Montana
Affiliation: Milwaukee Public Mus., Milwaukee, WI, United States
Pages: 556-560
Published: 199206
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 59
Accession Number: 1992-034409
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N46°52'60" - N47°58'00", W107°57'00" - W106°04'60"
N47°07'60" - N48°10'00", W106°34'60" - W105°13'00"
Secondary Affiliation: Univ. R.I., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1992
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