Mauch Chunk Formation

Red and green shale, reddish-purple mudstone, and red, green, brown, and gray thin-bedded and cross-bedded sandstones; thickness 500 feet in west, increases to about 800 feet in east.
State Maryland
Name Mauch Chunk Formation
Geologic age Mississippian
Lithologic constituents
Sedimentary > Clastic > Mudstone > ShaleRed and green shale
Sedimentary > Clastic > Sandstonered, green, brown, and gray thin-bedded and cross-bedded sandstones
Sedimentary > Clastic > Mudstonereddish-purple mudstone,

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

NGMDB product
Counties Allegany - Garrett