Shen et al. (2012) address critical issues related to fluctuating late Pleistocene sea levels, associated climate phases, and their likely impact during erosion and aggradation episodes in the Lower and Middle Mississippi River Valley. Nineteen new Pleistocene optically stimulated luminescence (OSL) values postdate marine isotope stage (MIS) 7 (Table 1). Originating in only 15 drill holes, widely scattered across a very large two-state area, they are comparable with dates obtained from the Lower Mississippi River Valley and adjacent coastal plain (Otvos, 2005; Mange and Otvos, 2005). Shen et al. (p. 690, 700) credit, not increased...

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