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Modeling the Sediment Fill of the UpperTroy Pre-Glacial Bedrock Valley,McHenry County, llinois, USA
Journal of Geoscience and Environment Protection (2016)
  • Jodi Lau
  • Jason F Thomason
  • David H. Malone, Illinois State University
  • Eric Wade Peterson
Abstract
The Troy Bedrock Valley (TBV) and its tributary valleys are the principal pre-glacial drainage insouthern Wisconsin and northern Illinois, USA. This study focused on the headwaters of a tributarythat occurs in McHenry County, IL. Drilling, geophysical surveys, and the analysis of existinggeologic and water well data were used to determine the lithologic and geometric characteristicsof the sediments that fill the paleovalley. A 3D geologic model of these sediments was then developedin Petrel. More than 65 m of Quaternary sediments filled the paleovalley. The model domaincovers approximately 30 km2. The valley drains to the west and meanders, which is distinct fromthe straight course of the overlying modern Kishwaukee River. The sediments that filled the valleywere subdivided into five units. These units include Illinois-age Glasford Formation coarsegrainedproglacial outwash and alluvial deposits (GS2, GS1) and fine-grained lacustrine anddiamicton deposits (G2 and G1). The Wisconsin-age Henry Formation sand and gravel cap the valleyfill, and Cahokia alluvium buries everything.
Keywords
  • Buried Bedrock Valley,
  • Glasford Formation,
  • Illinois,
  • 3D Geologic Model,
  • Quaternary
Disciplines
Publication Date
June, 2016
DOI
10.4236/gep.2016.46010
Citation Information
Jodi Lau, Jason F Thomason, David H. Malone and Eric Wade Peterson. "Modeling the Sediment Fill of the UpperTroy Pre-Glacial Bedrock Valley,McHenry County, llinois, USA" Journal of Geoscience and Environment Protection Vol. 4 (2016) p. 107 - 122
Available at: http://works.bepress.com/eric_peterson/17/