Absence of Glaciation in Illinois during Marine Isotope Stages 3 through 5
A 10 Be inventory and 14 C ages of material from a core from northernmost Illinois support previous interpretations that this area was ice free from ca. 155,000 to 25,000 yr ago. During much of this period, from about 155,000 to 55,000 yr ago, 10 Be accumulated in the argillic horizon of the Sangamo...
| Published in: | Quaternary Research |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Cambridge University Press (CUP)
1996
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1006/qres.1996.0040 http://api.elsevier.com/content/article/PII:S003358949690040X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358949690040X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400039132 |
| Summary: | A 10 Be inventory and 14 C ages of material from a core from northernmost Illinois support previous interpretations that this area was ice free from ca. 155,000 to 25,000 yr ago. During much of this period, from about 155,000 to 55,000 yr ago, 10 Be accumulated in the argillic horizon of the Sangamon Geosol. Wisconsinan loess, containing inherited 10 Be, was deposited above the Sangamon Geosol from ca. 55,000 to 25,000 yr ago and was subsequently buried by late Wisconsinan till deposited by the Lake Michigan Lobe of the Laurentide Ice Sheet. The Sangamonian interglacial stage has been correlated narrowly to marine oxygen isotope substage 5e; our data indicate instead that the Sangamon Geosol developed during late stage 6, all of stages 5 and 4, and early stage 3. |
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