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GEOREF RECORD

Vegetational history of the Shenandoah Valley, Virginia

Alan J. Craig
Vegetational history of the Shenandoah Valley, Virginia (in United States contributions to Quaternary research--Internat. Assoc. Quaternary Research, 8th Cong., Paris, 1969)
Special Paper - Geological Society of America (1969) 123: 283-296

Abstract

Two pollen diagrams from Hack and Quarles Ponds, in the southern part of the Shenandoah Valley, Va., show the followingpollen assemblage zones: (1) a basal Pinus-Picea zone with abundant conifers and large amounts of herbs, with two subzones, the top being 12,720 + or - 200 yr B.P.; (2) a Quercus zone, with very little conifer and two subzones, the upper being 9520 + or - 200 yr B.P.; (3) a Quercus-Pinus zone with substantial amounts of other deciduous tree pollen. These diagrams strongly resemble those from southeastern Virginia and North Carolina and differ markedly from those farther north in areas covered by Wisconsin ice. Substantial changes in vegetation occurred at considerable distances from the ice sheets. There is support also for the hypothesis that the Appalachians served as a refuge for Pinus and Picea during at least part of Wisconsin time.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 123
Title: Vegetational history of the Shenandoah Valley, Virginia
Title: United States contributions to Quaternary research--Internat. Assoc. Quaternary Research, 8th Cong., Paris, 1969
Author(s): Craig, Alan J.
Pages: 283-296
Published: 1969
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1969-032633
Categories: GeochronologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus., tables
N36°34'60" - N39°28'00", W83°34'60" - W75°15'00"
N42°30'00" - N47°00'00", W92°49'60" - W86°45'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1969
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