A COMPARISON OF OSL AND TL TECHNIQUES AND AGES WITHIN THE QUATERNARY STRATIGRAPHY OF THE WHITE RIVER BADLANDS
Varying luminescence techniques have formed a large body for proof of concept data on depositional history and process for these Holocene and Pleistocene sediments. Traditional thermoluminescence (TL) as well as Infrared Stimulated Luminescence (IRSL) were applied to silt-size feldspar grains from these deposits. For fine sand-size quartz grains, we used Blue OSL. For TL and IRSL, we generated ages using multiple-aliquot additive dose techniques, with some samples being run using a partial bleach technique. For Blue OSL, we ran samples using the single-aliquot regenerative technique. Generally, the dominant grain size in the deposit sampled was used for luminescence dating purposes, although occasionally the dominant size was greater than 180 microns and was thus ignored. The Blue-OSL and TL recorded older ages than the IRSL. Local stratigraphic relationships suggest that most mesa tops and dune formations were late Pleistocene or early Holocene. The oldest sample from Sheep Mountain Table was saturated with respect to luminescence and was older than 170,000 years, indicating late Pleistocene depositional processes. These samples aid in understanding the long-term development of the White River Badlands.