The DeKalb mounds of northeastern Illinois as archives of deglacial history and postglacial environments

Quaternary Research - Tập 74 - Trang 82-90 - 2010
B. Brandon Curry1, Michael E. Konen2, Timothy H. Larson1, Catherine H. Yansa3, Keith C. Hackley1, Helena Alexanderson4, Thomas V. Lowell5
1Illinois State Geological Survey, Institute of Natural Resource Sustainability, University of Illinois at Urbana-Champaign, 615 E. Peabody Dr., Champaign, IL 61820, USA
2Department of Geography, Northern Illinois University, De Kalb, IL 60115, USA
3Department of Geography, Michigan State University, 227 Geography Building, East Lansing, MI 48824-1117, USA
4Dept. of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden
5Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, USA

Tóm tắt

AbstractThe “type” DeKalb mounds of northeastern Illinois, USA (42.0°N, −88.7°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°W, 41.5028°N). The youngest age, 16,250 cal yr BP, is associated with a mound on the Deerfield Moraine (−87.9102°W, 42.4260°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.

Tài liệu tham khảo

10.1016/0022-1694(95)02694-K 10.1111/j.1502-3885.1996.tb00846.x Syverson, 2007, Pleistocene geology of Chippewa County, Wisconsin, Wisconsin Geological and Natural History Survey Bulletin, 103, 53 10.1139/z71-009 Delorme, 1989, Methods in Quaternary ecology. No 7a: freshwater Ostracoda, Geoscience Canada, 16, 85 1978, Recommendations on uniform color spaces, color difference, and psychometric color terms, Paris, CIE, Coloimetry, Publications, 15, 21 Wickham, 1988, Regional geology of the Tiskilwa Till Member, Wedron Formation, northeastern Illinois, Illinois State Geological Survey Circular, 543, 35 10.1130/SPE123-p49 10.1016/0033-5894(89)90081-1 10.1139/z70-042 10.1016/S0031-0182(98)00180-1 10.1006/qres.1995.1036 Curry, 2006, Subtle ice-walled lake terraces identified and mapped with shaded relief maps of 2-ft DEMS from aerial photography or LIDAR, Geological Society of America Abstracts With Programs, 38, 164 1999, Soil Taxonomy. A Basic System of Soil Classification for Making and Interpreting Soil Surveys, United States Department of Agriculture, Natural Resources Conservation Service, Agriculture Handbook No. 436, 871 McGarry, 2000, Shaded relief of Kane County, Illinois, Illinois State Geological Survey 10.1139/z70-194 10.1139/z70-214 10.1126/science.266.5193.1975 10.1111/j.1365-2478.1996.tb00142.x Hansel, 1996, The Wedron and Mason Groups, a lithostratigraphic reclassification of deposits of the Wisconsin Episode, Lake Michigan Lobe area, Illinois State Geological Survey Bulletin, 104, 116 10.1002/jqs.677 Hughes, 1994, Qualitative and quantitative analysis of clay minerals in soils, Quantitative Methods in Soil Mineralogy, 330 Clayton, 1967, Stagnant-glacier features of the Missouri Coteau in North Dakota, North Dakota Geological Miscellaneous Series, 30, 25 Bleuer, 1974, Distribution and significance of some ice-disintegration features in west-central Indiana, Indiana Geological Survey Occasional Paper, 8, 11p Buckley, 1975, Study of post-Pleistocene ostracode distribution in the soft sediments of southern Lake Michigan, Unpublished Ph.D. dissertation, 293 10.1016/S0169-555X(00)00072-6 10.1016/j.quascirev.2008.10.024 10.1016/j.geomorph.2007.02.045 De Gans, 1988, Pingo scars and their identification, 299 Graese, 1988, Geological–geotechnical studies for siting the Superconducting Super Collider in Illinois: regional summary, Illinois State Geological Survey Environmental Geology Notes, 123, 100 10.1130/MEM136-p229 Clayton, 1967, Pleistocene superglacial and ice-walled lakes of west-central North America, North Dakota Geological Survey, Miscellaneous Series, 30, 47 Curry, 2008, Surficial Geology of Hampshire Quadrangle, Kane and DeKalb Counties, Illinois, Illinois State Geological Survey Forester, 2006, North American Non-Marine Ostracode Database NANODe, Version 1 10.1086/626557 10.1017/S0033822200032999 Müller, 1963, Observations on pingos (D.A. Sinclair, translator): Canada National Research Council Technical Transactions, 1073, 177 1994, SEPA Method 6020A, determination of trace elements in waters and wastes by inductively coupled plasma–mass spectrometry, Rev. 5.4, In Methods for the Determination of Metals in Environmental Samples, PA-600/R-94/111, May 1994 Johnson, 2003, Supraglacial landsystems in lowland terrain, 228 Ianacelli, 2003, Reinterpretation of the original De Kalb mounds in Illinois: physical geography, 24, 170
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Quaternary Research

Tập 74

82-90

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