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Paleoenvironmental analysis of a middle Wisconsinan biota site, southwestern Virginia, U.S.A.

Published online by Cambridge University Press:  20 January 2017

G. Richard Whittecar ,
Thomas C. Wynn  and
Charles S. Bartlett Jr.
G. Richard Whittecar*
Affiliation:
Department of Ocean, Earth and Atmospheric Sciences, Old Dominion University, Norfolk, VA 23529, USA
Thomas C. Wynn
Affiliation:
Department of Ocean, Earth and Atmospheric Sciences, Old Dominion University, Norfolk, VA 23529, USA
Charles S. Bartlett Jr.
Affiliation:
Bartlett Geological Consultants, Abingdon, VA 24210, USA
*
*Corresponding author. Fax: +1 757 683 5303.E-mail address:[email protected] (G.R. Whittecar)
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Abstract

The Ratcliff Site in southwestern Virginia lies in a small second-order stream valley filled with approximately 3.5 m of organic-rich deposits that contain bones of mammoth, mastodon, deer (or antelope), logs, and plant macrofossils. Radiocarbon analyses indicate the age of the organic-rich sediment ranges from > 44,000 to 29,100 14C yr BP, a time period with no fossil remains reported in this region of the Appalachians. Analyses of field observations, textural data, organic carbon content, and plant macrofossils indicate that the organic-rich sediments contain interbedded standing-water and debris-flow deposits. Up to 6 m of oxidized debris-flow sediments bury the organic-rich sediments. The presence of Rubus parviflorus (Thimble Berry) throughout the deposit indicates the site had a boreal environment from > 44,000 to 29,100 14C yr BP. Plant macrofossil evidence indicates the uplands had stands of spruce/jack-pine forests while the valley contained ponds and associated wetlands. Three debris flows occurred at the site between approximately 38,000 and 29,000 14C yr BP, suggesting a recurrence interval for major storms of approximately 3000 yr, even though the apparent stability of the boreal environment implies a climate not conducive to catastrophic rainstorms. This conflicting combination of features suggests that during the middle Wisconsinan this area experienced generally cool climates, dominated by polar air masses, but was punctuated by relatively brief warm periods marked by incursions of tropical air masses.

Keywords

PaleoclimatePlant macrofossilLate PleistoceneCentral AppalachiansDebris flowsBoreal forestGeomorphology
Type
Research Article
Information
Quaternary Research , Volume 68 , Issue 1 , July 2007 , pp. 133 - 140
Copyright
University of Washington

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Footnotes

1 Present address: Geology and Physics Department, Lock Haven University, Lock Haven, PA 17745, USA.

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