The surficial Pliocene and Quaternary sedimentary deposits of the Atlantic Coastal Plain of Delaware comprise several formal and informal stratigraphic units. Their ages and the paleoenvironments they represent are interpreted on the basis of palynological and lithologic data and, to a lesser degree, on geomorphology.
Please give proper credit to the Delaware Geological Survey.
Groot, J.J. and Jordan, R.R. , 1999, The Pliocene and Quaternary Deposits of Delaware: Palynology, Ages, and Paleoenvironments: Delaware Geological Survey Report of Investigation 58,
Delaware Geological Survey
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