Observations drawn from a variety of archaeological sites in the central Middle Atlantic area are presented as possible indicators of mid-Holocene climatic change. Alluvial deposition records, sediment accretion in rockshelters, episodes of aeolian deposition, and evidence of extinct ponds indicate a series of depositional discontinuities that are dated roughly between 4200 and 2200 BP. These discontinuities are correlated with the xerothermic conditions of the Atlantic/Sub-Boreal period.
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