Mauch Chunk Formation (MDMmc;1)

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
Original map label	Mmc
Primary rock type	shale
Secondary rock type	mudstone
Other rock types	sandstone
Lithologic constituents	Major Sedimentary > Clastic > Sandstonered, green, brown, and gray thin-bedded and cross-bedded sandstones Sedimentary > Clastic > Mudstonereddish-purple mudstone, Sedimentary > Clastic > Mudstone > ShaleRed and green shale
Map references	Cleaves, E.T., Edwards, J., Jr., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.
Unit references	Cleaves, E.T., Edwards, J., Jr., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000. Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD
Geographic coverage	Allegany - Garrett