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Geochelone in Illinois and the Illinoian-Sangamonian Vegetation of the Type Region

Published online by Cambridge University Press:  20 January 2017

James E. King
Affiliation:
Illinois State Museum, Springfield, Illinois 62706 USA
Jeffrey J. Saunders
Affiliation:
Illinois State Museum, Springfield, Illinois 62706 USA

Abstract

An investigation of Illinoian- and Sangamonian-age deposits in the type region for both Pleistocene stages in central Illinois has yielded a palynological record spanning the Illinoian-year during at least the portion of the Sangamonian represented. Sangamonian boundary associated with an interglacial fauna containing Geochelone crassiscutata. The pollen indicates a shift from high Picea and Pinus to deciduous trees, followed by grass and herbaceous taxa, and finally, a return of deciduous trees. This sequence appears to correlate with marine isotopic stages 6 through 5d. Faunal remains are abundant throughout but megafauna are present only in the interglacial section where Geochelone occurs. The presence of Geochelone suggests above-freezing temperatures in central Ilinois throughout the

Type
Original Articles
Copyright
University of Washington

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