Basal Mixing Zones in Loesses of Louisiana and Idaho: I. Identification and Characterization

Schumacher, Brian; Lewis, G. C.; Miller, B. J.; Day, W.

doi:10.2136/sssaj1988.03615995005200030028x

Cited by 9 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been well documented that these overbank deposits are capped by a well-developed paleo sol and are mixed with overlying materials Schumacher et al, 1988;Autin and Aslan, 2001). This surface was subaerially exposed for at least thousands of years (Autin and Aslan, 2001), allowing reworking of the uppermost few meters.…”

Section: Other Sources Of Errormentioning

confidence: 99%

Rapid and widespread response of the Lower Mississippi River to eustatic forcing during the last glacial-interglacial cycle

Shen

Törnqvist

Autin

et al. 2012

Geological Society of America Bulletin

View full text Add to dashboard Cite

The Lower Mississippi Valley provides an exceptional fi eld example for studying the response of a continental-scale alluvial system to upstream and downstream forcing associated with the large, orbitally controlled glacialinter glacial cycles of the late Quaternary. However, the lack of a numerical chronology for the widespread Pleistocene strata assemblage known as the Prairie Complex, which borders the Holocene fl oodplain of the Lower Mississippi River, has so far precluded such an analysis. Here, we apply optically stimulated luminescence (OSL) dating, mainly on silt-sized quartz from Prairie Complex strata. In total, 27 OSL ages indicate that the Prairie Complex consists of multiple allostratigraphic units that formed mainly during marine isotope stages 7, 5e, and 5a. Thus, the aggradation of the Prairie Complex is strongly correlated with the sea-level highstands of the last two glacialinterglacial cycles. Fluvial incision during the sea-level fall associated with the MIS 5a-MIS 4 transition extended as far inland as ~600 km from the present-day shoreline, testifying to the dominant downstream control of fl uvial stratigraphic architecture in the Lower Mississippi Valley. In addition, the short reaction time of the Lower Mississippi River suggests that large fl uvial systems can respond much more rapidly to allogenic forcing than is commonly believed.

show abstract

Section: Other Sources Of Errormentioning

confidence: 99%

Rapid and widespread response of the Lower Mississippi River to eustatic forcing during the last glacial-interglacial cycle

Shen

Törnqvist

Autin

et al. 2012

Geological Society of America Bulletin

View full text Add to dashboard Cite

show abstract

Loess of the Upper Mississippi Valley Driftless Area

Leigh

Knox

1994

Quat. res.

View full text Add to dashboard Cite

Loess of the Driftless Area includes four distinct late Quaternary lithostratigraphic units: the Wyalusing (new), Loveland, Roxana, and Peoria formations. Erosion has removed parts or all of the pre-late Wisconsian loess at many sites. These formations consist largely of loess and retransported loess that typically occurs on uplands, terraces, and valley margins in the region. The oldest widespread formation (probably > 125,000 yr B.P.) is here formally named the Wyalusing Formation. The three younger formations correlate with the Loveland (probably > 125,000 yr B.P.), Roxana (55,000-25,000 yr B.P.), and Peoria (25,000-12,000 yr B.P.) loesses recognized elsewhere in the midcontinental United States. The soil/stratigraphic morphology of the Wyalusing-Loveland and Roxana-Peoria couplets appears to represent two distinct loess sedimentation sequences related to major expansion and contraction of the Laurentide Ice Sheet during oxygen isotope stages 6 and 3-2, respectively. The occurrence-frequency of loess units is inversely related to age, illustrating the erosional nature of the Driftless area landscape. The occurrence of four loess units at some sites in Driftless Area stratigraphic sections corroborates loess stratigraphy along the length of the Mississippi Valley, where typically not more than four or five loess units are found and they represent only the late and middle Pleistocene (<790,000 yr B.P.). Past climatic conditions, which favored erosion of loess, as well as a temporally erratic spatial extent of former continental ice sheets in North America, which provided the dust supply, probably account for the low number of loess units along the Mississippi Valley.

show abstract

Element concentration and partitioning of loess in the Huanghe (Yellow River) drainage basin, north China

et al. 1990

View full text Add to dashboard Cite

Basal Mixing Zones in Loesses of Louisiana and Idaho: I. Identification and Characterization

Cited by 9 publications

References 0 publications

Rapid and widespread response of the Lower Mississippi River to eustatic forcing during the last glacial-interglacial cycle

Rapid and widespread response of the Lower Mississippi River to eustatic forcing during the last glacial-interglacial cycle

Loess of the Upper Mississippi Valley Driftless Area

Element concentration and partitioning of loess in the Huanghe (Yellow River) drainage basin, north China

Contact Info

Product

Resources

About