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Age of the Fishcreekian transgression

Kristin McDougall
Age of the Fishcreekian transgression
Palaios (June 1995) 10 (3): 199-220


The Fishcreekian transgression is one of a sequence of late Cenozoic marine transgressions recognized on the Alaskan Arctic Coastal Plain. The Fish Creek beds of northern Alaska, which were designated as the type section for this transgression (Carter and Galloway, 1985), contain fossils interpreted as Pliocene in age (2.48 Ma, Repenning et al., 1987; 2.41-2.14 Ma, Brigham-Grette and Carter, 1992). Analysis of the benthic foraminifers in the Fish Creek beds, however, indicates that deposition occurred in the latest Pliocene and early Pleistocene between 1.7 and 1.2 Ma during a "warm" interval which was characterized by climatic conditions similar to the present or slightly warmer where temperatures shifted within a relatively narrow range. The late Pliocene to early Pleistocene benthic foraminiferal fauna is distinctive and can be traced throughout the circum-Arctic region. This fauna is dominated by elphidiums and elphidiellids, particularly E. hannai, E. rolfi, and E. ustulatum. Paleomagnetics, geochemical analyses, and world-wide climatic conditions support the latest Pliocene and early Pleistocene age interpretation for these deposits. Examination of the basis for the older age interpretation and the age of the diagnostic vertebrate, ostracode, molluscan, spore, and pollen species shows that the latest Pliocene and early Pleistocene age for the transgression is well within the limitations imposed by these fossil groups.

ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 10
Serial Issue: 3
Title: Age of the Fishcreekian transgression
Author(s): McDougall, Kristin
Affiliation: U. S. Geological Survey, Menlo Park, CA, United States
Pages: 199-220
Published: 199506
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 112
Accession Number: 1995-055211
Categories: Quaternary geologySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, strat. cols., sketch maps
N51°00'00" - N72°00'00", W130°00'00" - E173°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 199520
Program Name: USGSOPNon-USGS publications with USGS authors
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