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ABSTRACT

This field trip will highlight landform sediment assemblages and the geomorphic consequences and timing of multiple significant deglacial flood events at and near the confluences of the Minnesota and St. Croix rivers with the Upper Mississippi Valley. This geographic position is also near the former margins of two different Late Wisconsin glacial ice fronts. New radiocarbon and optical spectral luminescence (OSL) ages collected from these landform sediment assemblages are presented to help date the geomorphically transformative Late Wisconsin and earliest Holocene flood events of this complicated river confluence setting. Trip discussions will include pre–Late Wisconsin bedrock valley fill; geomorphology and gradients of genetically related terraces in the Upper Mississippi Valley and major west-side tributaries; comparisons between radiocarbon and OSL dating results; GIS mapping technologies and data sets; and contexts and predictions for buried archaeological resources.

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