Paleoecological Inferences Based on Pollen and Stable Isotopes for Mammoth-bearing Deposits of the Oahe Formation (Aggie Brown Member), Eastern Montana

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Late-Wisconsin eolian sediments assigned to the Aggie Brown Member of the Oahe formation were first described in North Dakota (Clayton and Moran 1979; Clayton et al. 1976; Clayton et al. 1980) and have been recognized in eastern Montana (Hill 2001; Hill and Davis 1998). The upland stratigraphy within the drainage of the South Fork of Deer Creek consists of eolian silts with several buried soils (paleosols) (Hill and Davis 1998). At one locality, a buried soil correlated with the Leonard Paleosol overlies eolian silts containing the remains of Mammuthus columbi (Davis and Wilson 1985; Hill and Davis 1998). There are several radiocarbon ages for these remains, including 11,500 ± 80 RCYBP (Beta-102031) and 12,330 ± 50 RCYBP (SR-5576) based on XAD-gelatin (KOH-collagen). Thus, radiocarbon dates on a Rancholabrean taxon indicate that deposits pf the Aggie Brown Member underlying a buried soil correlated with the Leonard Paleosol are late Wisconsinan. Pollen from these deposits can be used to help evaluate late-glacial ecological contexts on the northern Plains.

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