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Stratigraphy and age of a prominent paleosol in a late Pleistocene sedimentary sequence, Mason Neck, Virginia

December 29, 2021

The High Point paleosol is 2.28-meters-thick aggradational soil developed in fining upward estuarine-alluvial sand and loess. The paleosol is exposed in a few shoreline cliff faces of Mason Neck, Virginia. Although a former A horizon is missing, the E, Bw, Bt, and C horizon sequence seen in the sediments indicates subaerial pedogenesis. Pedogenesis began with initial estuarine-alluvial floodplain emergence as sea level was lowering in late marine isotope stage 5 (MIS5) and MIS4, continued during eolian silt deposition accompanied by incorporation of the silt into the estuarine-alluvial sand, and ended with a period of loess and eolian sand deposition, erosion, and development of periglacial(?) features. Six optically stimulated luminescence ages provide an age range from 86 to 56 ka (thousand years ago) for sedimentary units below and above the paleosol. These ages indicate a 10,000- to 30,000-year interval in late MIS5 and MIS4 for these events to have occurred.

Publication Year 2021
Title Stratigraphy and age of a prominent paleosol in a late Pleistocene sedimentary sequence, Mason Neck, Virginia
DOI 10.3133/ofr20211113
Authors Helaine W. Markewich, Douglas A. Wysocki, Milan J. Pavich, Joseph P. Smoot, Ronald J. Litwin
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2021-1113
Index ID ofr20211113
Record Source USGS Publications Warehouse
USGS Organization Eastern Geology and Paleoclimate Science Center; Florence Bascom Geoscience Center