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Inland Dunes On The Abandoned Bed Of Glacial Lake Chicago Indicate Eolian Activity During The Pleistocene-Holocene Transition, Southwestern Michigan, Usa, Patrick M. Colgan, William H. Amidon, Sara A. Thurkettle

Funded Articles

Inland dune fields have recently emerged as a source of data for reconstructing paleoenvironments and climate in the western Great Lakes region of North America during the Pleistocene-Holocene transition. We employ optically stimulated luminescence (OSL) methods, radiocarbon ages, soils, and landform relationships to determine the age of inland dunes in Ottawa County, Michigan. These dunes rest on the abandoned bed of Glacial Lake Chicago, which is thought to have been exposed after ~13.6 ka. OSL analyses from two inland dunes yield ages ranging from 13.3±1.1 to 11.6±0.9 ka (uncertainty = 2 σ). Fine sand in the parabolic dunes suggests deflation …