|
|||||
|
|
Latest Pleistocene paleoecology of Jefferson's ground sloth (Megalonyx jeffersonii) and elk-moose (Cervalces scotti) in northern Illinois |
|
| Authors: | Blaine W Schubert Russell Wm Graham Eric C Grimm |
| Institution: | a Environmental Dynamics, 113 Ozark Hall, University of Arkansas, Fayetteville, AR 72701, USA b Illinois State Museum, Research and Collections Center, 1011 East Ash Street, Springfield, IL 62703, USA c Denver Museum of Nature & Science, Denver, CO 80205, USA d Geologic Resources Division, National Park Service, Denver, CO 80225, USA e Stafford Research Laboratories, Inc., 5401 Western Avenue, Suite C, Boulder, CO 80301, USA |
| 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 sloth Megalonyx jeffersonii Elk-moose Cervalces scotti Late Pleistocene Paleoecology Extinction |
| 本文献已被 ScienceDirect 等数据库收录！ | |