FIRST APPLICATION OF OSL DATING TO TEST THE PERCHED-DUNE MODEL ON MICHIGAN COASTAL DUNES
This study tests the perched-dune model by using optically stimulated luminescence (OSL) dating, which directly estimates the timing of sand transport, at the Arcadia dune field in Benzie County, MI. At this site approximately 25m of eolian sand overlies about 100m of glacial sediments. Given previous studies elsewhere, we hypothesize that the basal eolian deposits accumulated during the Nipissing high stand (~ 6 ka) of ancestral Lake Michigan. Several distinct eolian units, each separated by paleosols, occur above these basal sands. OSL samples were collected from each of these sand deposits and will directly estimate when they accumulated. Results will be compared with known lake-level fluctuations to test the validity of the perched-dune model.