Gettysburg Shale

Red shale and soft red sandstone and siltstone; estimated thickness less than 5,000 feet.
State Maryland
Name Gettysburg Shale
Geologic age Triassic
Lithologic constituents
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Siltstone
Comments A new palynomorph species, FROELICHSPORITES TRAVERSEI, occurs throughout Newark Supergroup of eastern United States and Canada, Dockum Group of TX and NM, and Chinle Formation of NM, AZ, and UT. It is restricted geologically to strata deposited during upper Carnian and Norian Stages of the Upper Triassic. It occurs in the following formations of the Newark Supergroup: Passaic Formation (NJ), Gettysburg Formation (PA and MD), Manassas Sandstone (MD), Balls Bluff Siltstone (VA), Cow Branch Formation (NC), and Stoneville Formation (NC) [as reported by ref. MD005].
Stratigraphic units Newark Group

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

USGS Geologic Names lexicon found at:

NGMDB product
Counties Carroll - Frederick