Scanning electron microscope images of sand and silt from the early MIS4–MIS3 Roxana Silt, Phillips Bayou, Arkansas

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چکیده

First posted June 5, 2023 For additional information, contact: Director, Florence Bascom Geoscience CenterU.S. Geological Survey12201 Sunrise Valley DriveReston, VA 21092Contact Pubs Warehouse The age and source of the late Pleistocene Roxana Silt in Mississippi have been studied since middle 1800s. Published paleoenvironmental data for show that deposition occurred from marine isotope stage 5 (MIS5) through 3 (MIS3) (80–30 kilo-annum [ka]), when warm to hot interglacial climate early MIS5 (about 130 about 80 ka) was transitioning a considerably cooler wetter climate. Scanning electron microscopy/energy dispersive X-ray (SEM/EDS) analysis silt sand grains exposed an abandoned borrow pit near Phillips Bayou, Arkansas, performed as part 1990s study loess unglaciated lower Valley. Results were summarized publications, but grain morphology mineralogy not published. Some SEM/EDS analyses are presented this report. Combined with previously published chronostratigraphic pedostratigraphic at indicate some degree syndepositional weathering pedogenic alteration during after gradual eolian 4 (MIS4) MIS3 60 30 ka). support paleoclimate interpretations indicating least far south northern Mississippi, MIS4 70 cool cold humid wet.

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ژورنال

عنوان ژورنال: Scientific Investigations Report

سال: 2023

ISSN: ['2328-0328', '2332-5607', '2328-031X']

DOI: https://doi.org/10.3133/sir20235062