A multiagency and multijurisdictional approach to mapping the glacial deposits of the Great Lakes region in three dimensions

Berg, Richard C.; Brown, Steven E.; Thomason, Jason F.; Hasenmueller, Nancy R.; Letsinger, Sally L.; Kincare, Kevin A.; Esch, John M.; Kehew, Alan E.; Thorleifson, Harvey; Kozlowski, Andrew L.; Bird, Brian C.; Pavey, Richard R.; Bajc, Andy F.; Burt, A K; Fleeger, Gary M.; Carson, Eric C.

doi:10.1130/2016.2520(37)

Cited by 7 publications

(1 citation statement)

References 14 publications

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“…With the evolution of sophisticated geologic modeling software, many recent workers have strived to develop modern understanding of the 3D geometries of sediment bodies deposited in glacial setting [27]- [32]. In southwest McHenry County, a buried bedrock valley, which is a tributary of the Troy Bedrock Valley, has been filled almost completely with proglacial fluvial sediments, proglacial lacustrine sediments and ice-marginal sediments likely associated with Pre-Wisconsin Episode glaciations.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Sediment Fill of the Upper Troy Pre-Glacial Bedrock Valley, McHenry County, Illinois, USA

Lau¹,

Thomason²,

Malone³

et al. 2016

GEP

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The Troy Bedrock Valley (TBV) and its tributary valleys are the principal pre-glacial drainage in southern Wisconsin and northern Illinois, USA. This study focused on the headwaters of a tributary that occurs in McHenry County, IL. Drilling, geophysical surveys, and the analysis of existing geologic and water well data were used to determine the lithologic and geometric characteristics of the sediments that fill the paleovalley. A 3D geologic model of these sediments was then developed in Petrel. More than 65 m of Quaternary sediments filled the paleovalley. The model domain covers approximately 30 km 2. The valley drains to the west and meanders, which is distinct from the straight course of the overlying modern Kishwaukee River. The sediments that filled the valley were subdivided into five units. These units include Illinois-age Glasford Formation coarsegrained proglacial outwash and alluvial deposits (GS2, GS1) and fine-grained lacustrine and diamicton deposits (G2 and G1). The Wisconsin-age Henry Formation sand and gravel cap the valley fill, and Cahokia alluvium buries everything.

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Section: Introductionmentioning

confidence: 99%