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Latest Pleistocene paleoecology of Jefferson's ground sloth (Megalonyx jeffersonii) and elk-moose (Cervalces scotti) in northern Illinois

Published online by Cambridge University Press:  20 January 2017

Blaine W. Schubert ,
Russell Wm. Graham ,
H. Gregory McDonald ,
Eric C. Grimm  and
Thomas W. Stafford Jr.
Blaine W. Schubert*
Affiliation:
Environmental Dynamics, 113 Ozark Hall, University of Arkansas, Fayetteville, AR 72701, USA Illinois State Museum, Research and Collections Center, 1011 East Ash Street, Springfield, IL 62703, USA
Russell Wm. Graham
Affiliation:
Denver Museum of Nature & Science, Denver, CO 80205, USA
H. Gregory McDonald
Affiliation:
Geologic Resources Division, National Park Service, Denver, CO 80225, USA
Eric C. Grimm
Affiliation:
Illinois State Museum, Research and Collections Center, 1011 East Ash Street, Springfield, IL 62703, USA
Thomas W. Stafford Jr.
Affiliation:
Stafford Research Laboratories, Inc., 5401 Western Avenue, Suite C, Boulder, CO 80301, USA
*
*Corresponding author. Environmental Dynamics, 113 Ozark Hall, University of Arkansas, Fayetteville, AR 72701.E-mail address:[email protected] (B.W. Schubert).
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Abstract

New records of Jefferson's ground sloth (Megalonyx jeffersonii) and elk-moose (Cervalces scotti) from Lang Farm provide the first precise temporal correlation of these taxa with the specific environments inhabited by them near the time of their extinction. Six AMS 14C measurements establish an age of 11,405 ± 50 14C yr B.P. for Lang Farm Cervalces and an age of 11,430 ± 60 or 11,485 ± 40 14C yr B.P. for the Megalonyx. These measurements represent the youngest 14C dates for these two genera based on direct dating. Comparison of the dates with pollen data from northern Illinois indicates that these species inhabited a nonanalog environment that was transitional from mid-latitude tundra to mixed conifer and deciduous woodland. Although spruce (Picea sp.) was dominant, it was less abundant than prior to 12,500 14C yr B.P. The presence of black ash (Fraxinus nigra) and fir (Abies sp.) indicates a wet climate and heavy winter precipitation. This may have been the preferred habitat for Cervalces because of its narrow geographic range. However, this habitat type was only one of many occupied by Megalonyx as indicated by its broad geographic distribution.

Keywords

Jefferson's ground slothMegalonyx jeffersoniiElk-mooseCervalces scottiLate PleistocenePaleoecologyExtinction
Type
Research Article
Information
Quaternary Research , Volume 61 , Issue 2 , March 2004 , pp. 231 - 240
Copyright
University of Washington

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