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Main Title Internal stratigraphic correlation of the subsurface Potomac formation, New Castle County, Delaware, and adjacent areas in Maryland and New Jersey /
Author Benson, Richard N.
Other Authors
Author Title of a Work
McLaughlin, Peter P.
Publisher Delaware Geological Survey, University of Delaware,
Year Published 2006
OCLC Number 137314850
Subjects Stratigraphic correlation--Delaware--New Castle County ; Stratigraphic correlation--Maryland ; Stratigraphic correlation--New Jersey ; Aquifers--Delaware--New Castle County ; Aquifers--Maryland ; Aquifers--New Jersey
Internet Access
Description Access URL
Main volume
Plate 1
Plate 2
Plate 3
Library Call Number Additional Info Location Last
EJAM  QE95.B46 no.71 c.1 Region 3 Library/Philadelphia, PA 03/04/2022
EJAM  QE95.B46 no.71 c.2 Region 3 Library/Philadelphia, PA 03/04/2022
EJAM  QE95.B46 no.71 c.1 Region 3 Library/Philadelphia, PA 03/08/2022
EJAM  QE95.B46 no.71 c.2 Region 3 Library/Philadelphia, PA 03/08/2022
Collation 15 pages : color illustrations, color map ; 28 cm + 3 folded color plates.
Folded plates in pocket.
Contents Notes
This report presents a new time-stratigraphic framework for the subsurface Potomac Formation of New Castle County, Delaware, part of adjacent Cecil County, Maryland, and nearby tie-in boreholes in New Jersey. The framework is based on a geophysical well-log correlation datum that approximates the contact between Upper and Lower Cretaceous sediments. This datum is constrained by age determinations based on published and unpublished results of studies of fossil pollen and spores in samples of sediment cores from boreholes in the study area. Geophysical log correlation lines established above and below the datum approximate additional chronostratigraphic surfaces. The time-stratigraphic units thus defined are not correlated parallel to the basement unconformity, as in previous practice, but instead onlap it in an updip direction. In future studies, the sedimentary facies of the Potomac Formation within each time-stratigraphic layer may be mapped and analyzed as genetically related contemporaneous units. This new stratigraphic framework will allow better delineation of the degree of lateral connection between potential aquifer sands, thus enhancing understanding of aquifer architecture.