Surficial Geology of the New Haven, Iowa 7.5’ Quadrangle

Kerr, Phillip; Streeter, Matthew T.; Tassier-Surine, Stepanie; Clark, Ryan; Liu, Huaibao P.

doi:10.1130/abs/2016nc-275125

Cited by 3 publications

(10 citation statements)

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“…Subsequent STATEMAP program projects of the Iowa Geological Survey have focused on mapping the distribution of the Sheldon Creek Fm. east of the DML and defining the eastern boundary of the unit (Quade et al, 2012;Surine-Tassier et al, 2015;Kerr et al, 2016;Surine-Tassier et al, 2016).…”

Section: Search For a Middle Wisconsinan Glaciationmentioning

confidence: 99%

“…The Sheldon Creek Fm. occurs in the western portion of the IES, where it is discontinuous due to intense periglacial erosion that took place during the Late Wisconsinan (MIS 2) (Bettis and Autin, 1997;Quade et al, 2012;Surine-Tassier et al, 2015;Kerr et al, 2016;Surine-Tassier et al, 2016). Patterson (1997) suggested that in southwestern Minnesota the "Verdi Till", which is now the Verdi Member of the Wisconsinan-aged New Ulm Fm.…”

Section: The Sheldonmentioning

confidence: 99%

“…The formation of the IES took place during between 29-18 ka (MIS2) (Ruhe, 1969). This unnamed erosion surface sediment is comprised of alluvium, eolian sediments, and pedisediment (Ruhe et al, 1968;Ruhe, 1969;Prior, 1991;Kerr et al, 2015;Mason, 2015;Surine-Tassier et al, 2016). Derived from erosion and redeposition of local deposits, this mélange makes stratigraphic correlation difficult, as there are rarely paleosols, regionally extensive loess bodies, or datable material present.…”

Section: Relationship To Landscapes In Iowamentioning

confidence: 99%

“…The Sheldon Creek Fm. rests unconformably on Pre-Illinoian till (MIS >12), alluvium or colluvial deposits, or paleosols formed in these materials, or on Phanerozoic bedrock (Ruhe, 1950b;Bettis et al, 1996;Quade and Seigley, 2006;Kerr et al, 2016;Surine-Tassier et al, 2016). In this study, the Pre-Illinoian deposits are undifferentiated.…”

Section: Relationship To Landscapes In Iowamentioning

confidence: 99%

“…Where older Quaternary units are absent, the Sheldon Creek Fm. rests on eroded Phanerozoic bedrock (Bettis et al, 1996;Quade and Seigley, 2006;Kerr et al, 2016;Surine-Tassier et al, 2016). Figure 8 The National Gypsum Quarry's Quaternary Stratigraphy.…”

Section: Relationship To Landscapes In Iowamentioning

confidence: 99%

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Middle to early-late Wisconsin glaciation in north central Iowa

Kerr¹

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Section: Search For a Middle Wisconsinan Glaciationmentioning

confidence: 99%

Section: The Sheldonmentioning

confidence: 99%

Section: Relationship To Landscapes In Iowamentioning

confidence: 99%

Section: Relationship To Landscapes In Iowamentioning

confidence: 99%

Section: Relationship To Landscapes In Iowamentioning

confidence: 99%

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Middle to early-late Wisconsin glaciation in north central Iowa

Kerr¹

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

Tassier‐Surine,

Kerr,

Kilgore

et al. 2024

J Quaternary Science

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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.

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Analysis of legacy gravity data reveals sediment‐filled troughs buried under Flathead Valley, Montana, USA

Gebril,

Khalil,

Joeckel

et al. 2024

Near Surface Geophysics

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Shallow, dominantly silt‐ and clay‐filled erosional troughs in Quaternary sediments under the Flathead Valley (northwestern Montana, USA) are very likely to be hydraulic barriers limiting the horizontal flow of groundwater. Accurately mapping them is important because of increasing demand for groundwater. We used a legacy Bouguer gravity map measured in 1968. The directional derivatives of the map are computed, and the map was enhanced by implementing edge detection tools. We produced generalized derivative, maximum horizontal gradient, total gradient and tilt gradient maps through two‐dimensional Fourier transform analysis. These maps were remarkably successful in locating buried troughs in the northern and northwestern parts of the study area, closely matching locations determined previously from compiled borehole data. Our results also identify hitherto unknown extensions of troughs and indicate that some of the buried troughs may be connected.

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Surficial Geology of the New Haven, Iowa 7.5’ Quadrangle

Cited by 3 publications

References 0 publications

Middle to early-late Wisconsin glaciation in north central Iowa

Middle to early-late Wisconsin glaciation in north central Iowa

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

Analysis of legacy gravity data reveals sediment‐filled troughs buried under Flathead Valley, Montana, USA

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