Defining the Sheldon Creek Formation, a Middle Wisconsinan (MIS 3) till in Iowa, USA

STEPHANIE A. Tassier-Surine; PHILLIP J. Kerr; SUSAN M. Kilgore; BRADLEY D. Cramer

doi:10.1002/jqs.3627

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Defining the Sheldon Creek Formation, a Middle Wisconsinan (MIS 3) till in Iowa, USA

Journal article

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Defining the Sheldon Creek Formation, a Middle Wisconsinan (MIS 3) till in Iowa, USA

STEPHANIE A. Tassier-Surine, PHILLIP J. Kerr, SUSAN M. Kilgore and BRADLEY D. Cramer

Journal of quaternary science, Vol.39(6), pp.905-918

08/06/2024

DOI: 10.1002/jqs.3627

Appears in UI Libraries Support Open Access

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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 overlying Alden Member of the Dows Formation, and the two units are distinguished mainly by stratigraphic position. Differentiation from underlying Pre‐Illinoian till units is accomplished using lithology, primarily matrix grain‐size and sand fraction lithology. A suite of 22 radiocarbon ages indicate two distinct, separate groupings within the Sheldon Creek data. These data strongly suggest ice advanced south to 42° N twice, once during Marine Isotope Stage (MIS) 3 and again during late MIS 3 or possibly early MIS 2. The presence of the Laurentide Ice Sheet in northern Iowa during MIS 3 has significant implications for ice sheet reconstructions during this interval.

North America

Stratigraphy

glaciation

Iowa

Laurentide Ice Sheet

Middle Wisconsin

MIS 3

Quaternary

UIOWA OA Agreement

Details

Title: Subtitle: Defining the Sheldon Creek Formation, a Middle Wisconsinan (MIS 3) till in Iowa, USA
Creators: STEPHANIE A. Tassier-Surine - University of Iowa
PHILLIP J. Kerr - University of Iowa
SUSAN M. Kilgore - Adelphi University
BRADLEY D. Cramer - University of Iowa
Resource Type: Journal article
Publication Details: Journal of quaternary science, Vol.39(6), pp.905-918
Publisher: Wiley
DOI: 10.1002/jqs.3627
ISSN: 0267-8179
eISSN: 1099-1417
Language: English
Electronic publication date: 06/07/2024
Date published: 08/06/2024
Academic Unit: Earth and Environmental Sciences; Iowa Geological Survey; IIHR--Hydroscience and Engineering; International Programs
Record Identifier: 9984643656002771

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