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Pollen and Macrofossils from Wisconsinan Interstadial Sediments in Northeastern Georgia

Published online by Cambridge University Press:  20 January 2017

Stephen T. Jackson  and
Donald R. Whitehead
Stephen T. Jackson
Affiliation:
Department of Biological Sciences, Northern Arizona University, Flagstaff, Arizona 86011-5640
Donald R. Whitehead
Affiliation:
Department of Biology, Indiana University, Bloomington, Indiana 47405
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Abstract

Pollen and plant macrofossil analyses and dating (both TAMS and conventional 14 C) of wetland sediments from the Nodoroc Site in the Piedmont region of northeastern Georgia identified two depositional episodes of interstadial (ca. 26,000-22,000 yr B.P.) and mid- to late Holocene (<3600 yr B.P.) age. Interstadial pollen assemblages were dominated by Pinus and Quercus, with Carya, Picea, and Abies also present in significant amounts. The interstadial assemblages had lower Pinus and higher Quercus pollen percentages than apparently contemporaneous assemblages from sites in the southern Appalachians and Coastal Plain. Interstadial macrofossils included two needle morphotypes of Pinus subgenus Pinus, possibly indicating local occurrence of two Pinus species. One of the needle morphotypes is consistent with Pinus banksiana, but other species cannot be ruled out. Comparison of conventional and TAMS 14C dates illustrates problems in obtaining accurate age models from wetlands and ponds characterized by shallow or fluctuating water levels, low sedimentation rates, and vegetation growing on the depositional surface.

Type
Articles
Information
Quaternary Research , Volume 39 , Issue 1 , January 1993 , pp. 99 - 106
Copyright
University of Washington

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