Defining the Sheldon Creek Formation, a Middle Wisconsinan (MIS 3) till in Iowa, USA
STEPHANIE A. Tassier‐Surine,
PHILLIP J. Kerr,
SUSAN M. Kilgore
et al.
Abstract:A pre‐Late Wisconsinan, post‐Illinoian, till sheet has long been recognized in north‐central Iowa, but has not been formally recognized or defined until now. Early researchers referred to these deposits as the ‘Tazewell’, and the term ‘Sheldon Creek’ was more recently used informally by the Iowa Geological Survey in guidebooks and reports. Recent mapping has extended the eastern margin significantly past previous interpretations. The Sheldon Creek Formation has similar lithologic characteristics to the overlyi… Show more
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