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Chesapeake Group; Choptank Formation

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Interbedded brown to yellow very fine-grained to fine-grained sand and gray to dark bluish-green argillaceous silt; locally indurated to calcareous sandstone; prominent shell beds; thickness 0 to 50 feet.
State Maryland
Name Chesapeake Group; Choptank Formation
Geologic age Miocene
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Sand
Unconsolidated > Fine-detrital > Silt
Minor
Sedimentary > Clastic > Sandstone
Incidental
Sedimentary > Carbonate > Limestone > Coquinaprominent shell beds
Stratigraphic units Chesapeake Group
References

Cleaves, E.T., Edwards, J., Jr., and Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.

In 1995 the Water Resources Division of the U.S. Geological Survey digitized the geologic map of Maryland from the 1968 paper map (Reference MD001). Information about products from the Maryland Geological Survey can be found at http://www.mgs.md.gov/.
NGMDB product
Counties Calvert - Caroline - Dorchester - Saint Mary's - Talbot