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Internal stratigraphic correlation of the subsurface Potomac formation, New Castle County, Delaware, and adjacent areas in Maryland and New Jersey

Author: Richard N Benson; Peter P McLaughlin; Delaware Geological Survey.
Publisher: Newark, Del. : Delaware Geological Survey, University of Delaware, 2006.
Series: Report of investigations (Delaware Geological Survey), no. 71.
Edition/Format:   Print book : State or province government publication : EnglishView all editions and formats
Summary:
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  Read more...
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Additional Physical Format: Online version:
Benson, Richard N.
Internal stratigraphic correlation of the subsurface Potomac formation, New Castle County, Delaware, and adjacent areas in Maryland and New Jersey.
Newark, Del. : Delaware Geological Survey, University of Delaware, 2006
(OCoLC)894799615
Material Type: Government publication, State or province government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Richard N Benson; Peter P McLaughlin; Delaware Geological Survey.
OCLC Number: 137314850
Notes: Folded plates in pocket.
Description: 15 pages : color illustrations, color map ; 28 cm + 3 folded color plates.
Series Title: Report of investigations (Delaware Geological Survey), no. 71.
Responsibility: by Richard N. Benson ; with a contribution on palynology by Peter P. McLaughlin, Jr.

Abstract:

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 This datum is constrained by age determinations based on published and unpublished results of studies of fossil pollen and spores in samples of sediment cores from boreholes in the study area.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.

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