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Timing of latest Eocene molluscan extinction patterns in Mississippi

David M. Haasl and Thor A. Hansen
Timing of latest Eocene molluscan extinction patterns in Mississippi
Palaios (October 1996) 11 (5): 487-492


Molluscs removed from 12 bulk samples of the Yazoo Formation (upper Eocene), exposed in a quarry at Cynthia, Mississippi, are similar in composition and diversity to those found in the underlying upper Eocene Moodys Branch Formation, when differences in outcrop area are considered (7 4% of the Yazoo species are also found in the Moodys Branch). This suggests there was no significant extinction during the late Eocene (at the P15/P16 biozone boundary) as has been reported for planktic foraminifera. Only 11.4% of the species from the Yazoo extend into the Oligocene Red Bluff Formation, suggesting a large molluscan extinction at or near the Eocene-Oligocene boundary. The presence in the lowermost Red Bluff of an assemblage with a relatively high diversity dominated by suspension- feeding bivalves suggests that the molluscan fauna had recovered from the extinction by the earliest Oligocene.

ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 11
Serial Issue: 5
Title: Timing of latest Eocene molluscan extinction patterns in Mississippi
Affiliation: Western Washington University, Department of Geology, Bellingham, WA, United States
Pages: 487-492
Published: 199610
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 35
Accession Number: 1997-047552
Categories: Invertebrate paleontologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 2 tables, sketch map
N32°04'60" - N32°34'60", W90°45'00" - W90°10'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199716
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