Abstract
Optical dating of silt-sized potassium feldspar grains was found to be suitable for dating the formation of key loess units at two sites on the central east European Plain. Loess bracketing the Bryansk palaeosol yielded optical ages in agreement with the well-dated radiocarbon chronology when corrected for anomalous fading. Optical ages from loess bracketing a significant pedogenic unit below the Bryansk palaeosol support our lithostratigraphic interpretation that it is the Mezin palaeosol complex, and its formation during the Last Interglaciation, Oxygen Isotope Stage (OIS) 5. Optical ages from a stratigraphically older loess unit directly underlying a significant (∼10 m thick) till unit, in conjunction with its regional stratigraphic context, suggest that the loess, and the till were deposited during the Dnieper Glaciation, which probably occurred during OIS 6.
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