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The DeKalb mounds of northeastern Illinois as archives of deglacial history and postglacial environments
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2010 (English)In: Quaternary Research, ISSN 0033-5894, E-ISSN 1096-0287, Vol. 74, no 1, 82-90 p.Article in journal (Refereed) Published
Abstract [en]

The ""type"" DeKalb mounds of northeastern Illinois, USA (42.0 degrees N, -88.7 degrees W), are formed of basal sand and gravel overlain by rhythmically bedded fines, and weathered sand and gravel. Generally from 2 to 7 m thick, the fines include abundant fossils of ostracodes and uncommon leaves and stems of tundra plants. Rare chironomid head capsules, pillclam shells, and aquatic plant macrofossils also have been observed. Radiocarbon ages on the tundra plant fossils from the ""type"" region range from 20,420 to 18,560 cal yr BP. Comparison of radiocarbon ages of terrestrial plants from type area ice-walled lake plains and adjacent kettle basins indicate that the topographic inversion to ice-free conditions occurred from 18,560 and 16,650 cal yr BP. Outside the ""type"" area, the oldest reliable age of tundra plant fossils in DeKalb mound sediment is 21,680 cal yr BP; the mound occurs on the northern arm of the Ransom Moraine (-88.5436 degrees W, 41.5028 degrees N). The youngest age, 16,250 cal yr BP, is associated with a mound on the Deerfield Moraine (-87.9102 degrees W, 42.4260 degrees N) located about 9 km east of Lake Michigan. The chronology of individual successions indicates the lakes persisted on the periglacial landscape for about 300 to 1500 yr.

Place, publisher, year, edition, pages
2010. Vol. 74, no 1, 82-90 p.
Keyword [en]
Deglaciation, Ice-walled lake, Pingo, Ostracode, Plant macrofossil
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Research subject
Quarternary Geology
URN: urn:nbn:se:su:diva-50891DOI: 10.1016/j.yqres.2010.04.009ISI: 000279758300011OAI: diva2:383367
authorCount :7Available from: 2011-01-04 Created: 2011-01-03 Last updated: 2011-01-13Bibliographically approved

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Alexanderson, Helena
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Department of Physical Geography and Quaternary Geology (INK)
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