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Geology; January 2002; v. 30; no. 1; p. 55-58; DOI: 10.1130/0091-7613(2002)030<0055:WMHDFI>2.0.CO;2
© 2002 Geological Society of America
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Widespread middle Holocene dune formation in the eastern Upper Peninsula of Michigan and the relationship to climate and outlet-controlled lake level

Alan F. Arbogast1, Ann G. Wintle2 and Susan C. Packman2

1 Department of Geography, Michigan State University, East Lansing, Michigan 48824-1115, USA
2 Institute of Geography and Earth Sciences, University of Wales, Aberystwyth SY23 3DB, UK

Dating of five widely spaced (noncoastal) dunes in eastern upper Michigan by optically stimulated luminescence of quartz establishes that eolian sand was last mobilized between ca. 7 and 5.5 ka in the region. Although this interval corresponds to the drier Altithermal- Hypsithermal period, climate alone may not have been sufficiently arid to cause dune formation in this area. Instead, it appears that dune formation may also be linked to depressed water tables, associated with outlet-controlled low levels in Lakes Michigan and Superior. Following dune stabilization, peat began to accumulate in interdune areas ca. 4.4 ka.

Key Words: dunes • Holocene climate • optically stimulated luminescence (OSL) dating • lake levels • peat




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