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The Manila high, an elliptical area 19km long (N–S) by 6km wide (E–W) located west-southwest of Big Lake, Arkansas, has less than 3m of topographic relief. Geomorphic, stratigraphic and chronology data indicate that Big Lake formed during at least two periods of Holocene uplift and subsequent damming of the south-flowing Little River. Age data of an organic mat located at the base of an upper lacustrine...