Skip to main content

Maccrady Formation and Pocono Group, undivided

Maccrady Formation and Pocono Group, undivided - Maccrady Formation: red shale and mudrock, red and green sandstone, and minor limestone. Present only from Pendleton County southward. Contains rock salt and gypsum in southwestern Virginia. Pocono Group: predominantly hard gray massive sandstones, with some shale. In the Eastern Panhandle, has been divided into the Hedges, Purslane, and Rockwell Formations.
State West Virginia
Name Maccrady Formation and Pocono Group, undivided
Geologic age Mississippian
Comments Printed map has no indiviual description for this unit and no name, but has individual symbol and color. Only uses brackets to combine Mmcc and Mp. Mmp is used in digital map, so combined Mmcc and Mp together and called this the "Maccrady Formation and Pocono Group, undivided". Combined thickness: Northeastern 570-1030 ft, Western 525 ft, Southeastern 350-1250 ft
Primary rock type shale
Secondary rock type sandstone
Other rock types mudstone; limestone; chemical
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > ShaleMaccrady Formation: red shale and mudrock; Pocono Group: some shale
Sedimentary > Clastic > SandstoneMaccrady Formation: red and green sandstone; Pocono Group: predominantly hard gray massive sandstones
Minor
Sedimentary > Clastic > MudstoneMaccrady Formation: red shale and mudrock
Sedimentary > Carbonate > Limestone
Incidental
Sedimentary > Chemical > Evaporite > SaltMaccrady Formation: contains rock salt and gypsum is southwestern Virginia.
Sedimentary > Chemical > Evaporite > GypsumMaccrady Formation: contains rock salt and gypsum is southwestern Virginia.
Map references
Digital version of 1968 printed map available from http://wvgis.wvu.edu/data/data.php with the specific data available from http://wvgis.wvu.edu/data/dataset.php?action=search&ID=43
Unit references
Cardwell, D.H., Erwin, R.B., and Woodward, H.P., 1968 (slightly revised 1986), Geologic Map of West Virginia: West Virginia Geological and Economic Survey, Map 1, East Sheet, scale 1:250,000.
Counties Mercer - Monroe