As part of an archaeology study on the Fort Bliss Military Reservation in west Texas, Hall et al. (2010) reported optically stimulated luminescence (OSL) dates from two backhoe trenches referred to as localities 100 and 200. In both trenches, a sedimentary unit termed “Q3” was designated based on soil morphology. The authors correlate their Q3 unit to the unconformity-bound allostratigraphic “Organ” unit, which has an age range of 7.5–0.01 ka based on radiocarbon dates of buried charcoal (Ruhe, 1964; Gile and Hawley, 1968; Blair et al., 1990). At locality 100, two profiles were sampled 30 m...

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