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GEOREF RECORD

Significance of Pleistocene fluvial systems and glaciations on the landscape evolution of northern Kentucky

Matthew A. Massey, William Andrews, Steven L. Martin, Maxwell Hammond and Antonia E. Bottoms
Significance of Pleistocene fluvial systems and glaciations on the landscape evolution of northern Kentucky (in Ancient oceans, orogenic uplifts, and glacial ice; geologic crossroads in America's heartland, Lee J. Florea)
Field Guide (Geological Society of America) (December 2018) 51: 165-180

Abstract

Pleistocene glacial and interglacial episodes had a profound influence on erosion, sediment transport, and topographic expression in the Midwestern United States. Northern Kentucky hosts a variety of fluvial and glacial features that record these Quaternary advances and retreats of the Laurentide ice sheet. This field trip highlights the major glacial and interglacial episodes of the Pleistocene, including the Pliocene-Early Pleistocene Teays drainage system, the Early-Middle Pleistocene pre-Illinois glacial Episode, the Middle Pleistocene Yarmouth interglacial, the Illinois glacial Episode in the Middle Pleistocene, the Sangamon interglacial, and the Late Pleistocene Wisconsin Episode. The Old Kentucky River was tributary to the Teays, depositing sands at ca. 1.5 Ma, confirmed by multiple (super 10) Be- (super 26) Al cosmogenic radionuclide burial ages. Glacial till uncoformably overlies Old Kentucky River sands and demonstrates that pre-Illinois ice extended into Kentucky. The modern-day course of the Ohio River was incised after the pre-Illinois Episode, and then aggraded with transportation of Illinois Episode glacial outwash. Deposition of outwash at the mouths of tributaries caused impoundment and slackwater deposition in tributary valleys; the Claryville Clay has long been assumed to represent a pre-Illinois lacustrine deposit, but new optically stimulated luminescence feldspar geochronology yields a Middle Pleistocene age of ca. 320 ka. We have not observed Illinoian till in Kentucky. The final advance of the Laurentide ice sheet did not reach Kentucky, however, high sediment volumes were transported along the Ohio River and impounded tributaries, similar to the Illinois Episode.


ISSN: 2333-0937
EISSN: 2333-0945
Serial Title: Field Guide (Geological Society of America)
Serial Volume: 51
Title: Significance of Pleistocene fluvial systems and glaciations on the landscape evolution of northern Kentucky
Title: Ancient oceans, orogenic uplifts, and glacial ice; geologic crossroads in America's heartland
Affiliation: University of Kentucky, Kentucky Geological Survey, Lexington, KY, United States
Affiliation: Indiana University, Indiana Geological and Water Survey, Bloomington, IN, United States
Pages: 165-180
Published: 20181210
Text Language: English
Publisher: Geological Society of America, Boulder, CO, United States
References: 43
Accession Number: 2020-016648
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N38°45'00" - N39°10'00", W84°15'00" - E84°55'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 202011
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