Pleistocene Lake Calvin, Eastern Iowa

Ruhe, Robert V.; Prior, Jean C.

doi:10.1130/0016-7606(1970)81[919:plcei]2.0.co;2

Cited by 3 publications

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“…Pratt interpreted the sedimentary sequences to indicate a pre-Illinoian (classical Kansan) and two separate Illinois Episode periods of glaciation and lake formation. Amadi (1980) studied groundwater chemistry of some deep wells in the western end of the Flatwoods but, more importantly, he suggested there is no buried Sangamon Geosol in the region and that the region is filled with late Pleistocene alluvium derived from erosion surfaces, analogous to Lake Calvin in Iowa as interpreted by Ruhe and Prior (1970). Of regional importance, Gray (1988) described a relict ice-marginal drainage system that bordered the Illinois Episode and perhaps other ice sheets.…”

mentioning

confidence: 99%

Quaternary Stratigraphy and Geomorphic History of the Flatwoods Region of Owen and Monroe Counties, Indiana

Jacobs

Gray

Loope

et al. 2023

IJES

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The Flatwoods region of Owen and Monroe Counties, Indiana is an archetype of late Quaternary history of the southern Midwest. We compile decades of field observations and sampling, including soil cores, a deep test hole, and hundreds of water well, seismic, and other data sources, to construct a detailed Quaternary stratigraphy and geomorphic history of the region, including a model of the preglacial bedrock topography. Optically stimulated luminescence (OSL) techniques provide the first numerical ages of the sediments and reveal the Illinois Episode glacier advanced into the region between 111-175 ka. Gray, calcareous Illinois Episode sediments dominate the valley fill, but highly weathered red glaciogenic sediments in the eastern part of the region may be related to a pre-Illinois Episode glacial event. Fine-grained stratified lake sediments indicate the southwestward draining bedrock valley was flooded as glacial ice entered the drainage basin. Sandy outwash covers the lake sediment marking the advance of glacier ice that ultimately crossed the basin and deposited till. Till is found in several ice-marginal ridges interpreted to be moraines marking the glacial limit. The Flatwoods valley routed water to the east end of the region where it spilled over one or more cols into Raccoon Creek, then continued toward the Ohio River in a glacial drainage system developed along the glacier margin. The Sangamon Geosol is a pervasive soil stratigraphic unit developed into Illinois Episode sediments, eroded only in modern stream valleys. The Geosol is well expressed morphologically, noted mostly by deep leaching of carbonates, red colors, and weathered mineralogy. Wisconsin Episode glaciation is represented by eolian sediments, including a thin increment of silty sediment incorporated into the upper solum of the Sangamon Geosol. Windblown Peoria Loess, deposited between ~27-16 ka, blankets the entire Flatwoods region, with greatest thicknesses preserved on flat lake or outwash plain landforms. Supplemental DataGeodatabase: The geodatabase includes locations of water-well records, borehole and outcrop sites, geophysical (gamma-ray) logs, refraction seismic surveys, passive seismic (horizontal-to-vertical spectral ratio [HVSR]) surveys, and data from the geological literature.Metadata: FGDC-compliant metadata for geodatabase.Data: Analytical data and other geological information include: a downhole geophysical (gamma-ray); data from the 2019 test hole, including clay mineralogy, core photographs, a downhole gamma-ray log, and particle size analysis; Indiana Geological and Water Survey (IGWS) archive data, which is comprised of borehole descriptions; a copy of Jacobs' (1994) Ph.D. dissertation; scanned profile description sheets and core stratigraphy from Jacobs (1994); and supplementary optically stimulated luminescence (OSL) data.ReadMe: Detailed file directory explaination of items within each of the supplemental data item ZIP files.

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mentioning

confidence: 99%

Quaternary Stratigraphy and Geomorphic History of the Flatwoods Region of Owen and Monroe Counties, Indiana

Jacobs

Gray

Loope

et al. 2023

IJES

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“…Shaffer concluded that if the high terrace described by Schoewe (1920) was an upstream equivalent of the terrace near Wapello, Iowa, then it was post-Sangamon and not Illinoian as regarded by Schoewe. Radiocarbon dating of peat samples collected sev eral years later at Shaffer's site near Wapello, Iowa, yielded dates of 23,750 ± 600 and 23,050 ± 820 years before present (Ruhe, 1968;Ruhe and Prior, 1970). Shaffer's (1954) interpretation of the peat as being Sangamon in age, they do substantiate Shaffer's hypothesis that the overlying terrace sediments are, in fact, within the presently accepted Tazewell radiocarbon time framework in Iowa (Ruhe, 1956(Ruhe, , 1969.…”

Section: Examination Of Terraces In the Lower Iowa River Valley Nearmentioning

confidence: 72%

Geomorphology, stratigraphy, and soil development in the Iowa and Cedar River valleys in southeastern Iowa

Bicki

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Three late‐glacial pollen and plant Macrofossil assemblages from Iowa

Baker

Zant

Dulian³

1980

Palynology

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Late-glacial pollen and plant macrofossil assemblages from the Brayton gravel pit in southwestern Iowa, Nichols silts in southeastern Iowa, and Summer Bog in northeastern Iowa indicate that a spruce-larch forest was present between about 12,500 and 11,500 radiocarbon years before present (RCYBP). Some forest openings probably existed at Brayton and during the lower zone recognized at Sumner Bog, but not at Nichols. All Sites contain pollen of thermophilous species; macrofossils of Quercus rubra (northern red oak) and Corylus cornuta (beaked hazel) at Brayton and of Acer negundo (box elder) at Nichols indicate that some thermophilous plants were locally present. Fir trees were present in small numbers, but pine was absent.

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Pleistocene Lake Calvin, Eastern Iowa

Cited by 3 publications

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Quaternary Stratigraphy and Geomorphic History of the Flatwoods Region of Owen and Monroe Counties, Indiana

Quaternary Stratigraphy and Geomorphic History of the Flatwoods Region of Owen and Monroe Counties, Indiana

Geomorphology, stratigraphy, and soil development in the Iowa and Cedar River valleys in southeastern Iowa

Three late‐glacial pollen and plant Macrofossil assemblages from Iowa

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