Regional chronostratigraphic correlation of middle Atlantic upper Coastal Plain and Fall Zone fluvial deposits, long thought to represent the updip, proximal facies of a well-dated, post-Oligocene marine sequence in the Salisbury Embayment, remains incomplete, in part, because of the paucity of biostratigraphic data. Petrography-based lithostratigraphic correlations provide an opportunity to extend age control present in downdip marine deposits, updip to fluvial deposits, thus establishing the means for a regional chronostratigraphic correlation. Previous stratigraphic studies in New Jersey, Delmarva, southern Maryland, Virginia, and the central Appalachian Piedmont are linked by a crucial sequence of fluvial deposits at the head of Chesapeake Bay. Here petrography-based lithostratigraphic correlations demonstrate (1) late Oligocene-late Miocene, Susquehanna River-dominated, polygenetic, quartzose fluvial aggradation (Bryn Mawr Formation); (2) Pliocene, heterolithic, but quartz-dominated fluvial-terrace and alluvial-fan deposition (Perryville formation); (3) Pliocene-early Pleistocene, paleo-Delaware-Hudson River- dominated, lithic- and feldspathic-rich, fluvial aggradation (Pensauken Formation); and (4) the initiation of estuarine conditions (Turkey Point beds) by early Pleistocene time. These results are synthesized to propose a new late Cenozoic regional chronostratigraphic correlation and depositional history for the Salisbury Embayment. The correlation elucidates a complex interaction between passive margin isostasy, tectonics, eustasy, and sediment source.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.