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Mineral Resources On-Line Spatial Data

Monongahela Formation

Monongahela Formation - Interbedded claystone, argillaceous limestone, shale, sandstone, and coal beds; Waynesburg coal at top; Pittsburg coal at base; thickness 240 feet in west, increases to 375 feet in east.
StateMaryland
NameMonongahela Formation
Geologic agePennsylvanian
Original map labelPm
Primary rock typeclaystone
Secondary rock typelimestone
Other rock typesshale; sandstone; coal
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone
Sedimentary > Clastic > Mudstone > Claystone
Minor
Sedimentary > Clastic > Mudstone > Shale
Incidental
Sedimentary > Coal
Sedimentary > Clastic > Sandstone
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Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD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 coverageAllegany - Garrett

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