Chronologic evidence for multiple periods of loess deposition during the Late Pleistocene in the Missouri and Mississippi River Valley, United States: Implications for the activity of the Laurentide ice sheet

Forman, Steven L.; Bettis, E. Arthur; Kemmis, Timothy J.; Miller, Barry B.

doi:10.1016/0031-0182(92)90184-7

Cited by 87 publications

(53 citation statements)

References 25 publications

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“…(Forman et al, 1992) support a correlation of the Pisgah Formation with the Roxana Silt in Illinois (Cuny and Follmer, 1992) and the Gilman Canyon Formation in Nebraska and Kansas (Martin, 1993;May and Holen, 1993;Maat and Johnson, 1996). Peoria Loess occurs above the Pisgah Formation and is a light-brown, massive silt loam.…”

Section: Loess Stratigraphy and Geochronology In Western Iowasupporting

confidence: 52%

“…is not mantled by Peoria Loess (Daniels et al, 1963;Bettis, 1990). From all of these age Loess, ranging from -110,000 to -165,000 cal yr B.P., sup-estimates, we conclude that Peoria Loess deposition in western port this correlation (Forman et al, 1992) and are in good Iowa may have begun -27,000-24,000 yr B.P. Loess agreement with TL ages of Loveland Loess from Nebraska deposition could have ended as early as 14,000 "C yr B.P., but (Maat and Johnson, 1996).…”

Section: Loess Stratigraphy and Geochronology In Western Iowamentioning

confidence: 63%

“…and ended about 14,000-12,000 14 C yr B.P. (Follmer, 1983;Forman et al, 1992;Grimley et al, 1998;Maat and Johnson, 1996;Mandel and Bettis, 1995;McKay, 1979;Muhs et al, 1999;Rodbell et al, 1997;Ruhe, 1969;Ruhe et al, 197 I), a time interval that brackets the LGM. COHMAP members (1988COHMAP members ( , p. 1052 recognized the disparity between their model and interpretation of loess-derived paleowinds and suggested that the northwesterly winds which transported loess were a seasonal phenomenon.…”

Section: Discussionmentioning

confidence: 99%

“…1 and 2). Three loess units have been identified in western Iowa based on detailed stratigraphic studies by Ruhe (1954Ruhe ( , 1969Ruhe ( , 1983, Daniels and Handy (1959), Bettis (1990), and Forman et al (1992), and all three are present at the Loveland paratype locality (Fig. 3).…”

Section: Loess Stratigraphy and Geochronology In Western Iowamentioning

confidence: 99%

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Geochemical Variations in Peoria Loess of Western Iowa Indicate Paleowinds of Midcontinental North America during Last Glaciation

2000

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(AGCMs) provide simulations of past, present, and future Peoria Loess deposited in western Iowa during the last glacial climates on global or regional scales. Because these models are maximum (LGM) shows distinct geochemical and particle-size simplified reconstructions of the atmosphere, they require cornvariations as a function of both depth and distance east of the Darison with emDiricallv based reconstructions~ The geologic Missouri River. Geochemical and particle-size data indicate that Peoria Loess in western Iowa probably had two sources: the Missouri River valley, and a source that lay to the west of the Missouri River. Both sources indicate that LGM paleowinds in western Iowa had a strong westerly component, similar to interpretations of previous workers. A compilation of loess studies in Iowa and elsewhere indicates that westerlv winds were dominant during . , loess transport over much of the midcontinent south of the Laurentide ice sheet, which is not in agreement with paleowinds simulated by atmospheric general circulation models (AGCMs). AGCMs consistently generate a glacial anticyclone with easterly or northeasterly winds over the Laurentide ice sheet and the area to the south of it. Loess deposition in the midcontinent during theLGM may be a function of infrequent northwesterly winds that were unrelated to the presence of the glacial anticyclone. 0 2000 University of Washington.

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Section: Loess Stratigraphy and Geochronology In Western Iowasupporting

confidence: 52%

Section: Loess Stratigraphy and Geochronology In Western Iowamentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Loess Stratigraphy and Geochronology In Western Iowamentioning

confidence: 99%

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Geochemical Variations in Peoria Loess of Western Iowa Indicate Paleowinds of Midcontinental North America during Last Glaciation

2000

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“…The Sangamon Soil developed in the upper part of the Loveland Loess and represents the majority of the Sangamon interglacial (MIS5) until deposition of the Gilman Canyon Formation. Optically stimulated luminescence (OSL) dating of the loess and 14 C dating of the overlying soil organic matter suggest that the Gilman Canyon Formation accumulated sometime between ~ 45,000 and 25,000 cal yr BP (Forman et al, 1992, Maat and Johnson, 1996, Muhs et al, 1999,000 cal yr BP) are interpreted as a product of a C4 dominated grassland, with July temperatures at least as warm as today (Johnson et al, in press). This interpretation is consistent with the grassland-sage steppe community inferred between 34,000 and 29,000 cal yr BP from a pollen record from the Cheyenne bottoms in central Kansas (Fredlund, 1955).…”

Section: Introductionmentioning

confidence: 99%

Lacustrine evidence for moisture changes in the Nebraska Sand Hills during Marine Isotope Stage 3

2007

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In the central Great Plains of North America, loess stratigraphy suggests that climate during the late Pleistocene was cold and dry. However, this record is discontinuous, and there are few other records of late-Pleistocene conditions. Cobb Basin, located on the northern edge of the Nebraska Sand Hills, contains lacustrine sediments deposited during Marine Isotope Stage 3, beginning approximately 45,000 cal yr BP and continuing for at least 10,000 yr. The lake was formed by a dune dam blockage on the ancient Niobrara River, and its deposits contain a diatom record that indicates changes through time in lake depth driven by changes in effective moisture. During the earliest stages of lake formation, the climate was arid enough to mobilize dunes and emplace dune sand into a blocking position within the Niobrara streambed. Diatom assemblages suggest that lake-level was shallow at formation, increased substantially during a wet interval, and then became shallow again, as arid conditions resumed. By about 27,000 cal yr BP the lake was filled, and a shallow ephemeral river occupied the basin.

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Comparative riverscape genomics of the rainbow darter (Etheostoma caeruleum) in glaciated and unglaciated environments

Gamble

Berendzen

2021

Ecology and Evolution

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Chronologic evidence for multiple periods of loess deposition during the Late Pleistocene in the Missouri and Mississippi River Valley, United States: Implications for the activity of the Laurentide ice sheet

Cited by 87 publications

References 25 publications

Geochemical Variations in Peoria Loess of Western Iowa Indicate Paleowinds of Midcontinental North America during Last Glaciation

Geochemical Variations in Peoria Loess of Western Iowa Indicate Paleowinds of Midcontinental North America during Last Glaciation

Lacustrine evidence for moisture changes in the Nebraska Sand Hills during Marine Isotope Stage 3

Comparative riverscape genomics of the rainbow darter (Etheostoma caeruleum) in glaciated and unglaciated environments

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