Integrating Stalagmite, Vertebrate, and Pollen Sequences to Investigate Holocene Vegetation and Climate Change in the Southern Midwestern United States |
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| Authors: | Rhawn F Denniston Luis A Gonzalez Holmes A Semken Jr Yemane Asmerom Richard G Baker Heather Recelli-Snyder Mark K Reagan E Arthur Bettis III |
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| Institution: | a Department of Geology, University of Iowa, Iowa City, Iowa, 52242;b Department of Earth & Planetary Science, University of New Mexico, Albuquerque, New Mexico, 87131;Department of Geology, University of Iowa, Iowa City, Iowa, 52242, f1 |
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| Abstract: | Speleothem carbon and oxygen isotopic records from Onondaga Cave, south-central Missouri, and Beckham Creek Cave, north-central Arkansas, are compared with the Cupola Pond and Oldfield Swamp pollen series from southeastern Missouri and the Rodgers Shelter and Modoc Shelter vertebrate biostratigraphic sequences from central Missouri and southwestern Illinois. Similar, and roughly contemporaneous, shifts between deciduous forest and steppe indicators throughout the Holocene are revealed in each database. These independent proxies record steppe conditions between approximately 9000 and 1500 cal yr B.P. A shift toward lighter speleothem carbon may reflect a change from warm and dry to cool and dry conditions between 4500 and 3000 yr B.P. The sensitive response of speleothem δ13C to changes in vegetation emphasizes their importance as paleoclimate records in an area containing few other millenial-scale climate proxies. |
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| Keywords: | speleothem vertebrates pollen paleoclimate Holocene Midwest |
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