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Monongahela Group (OHPAm;0)

Geologic Formation in OH, WV

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Lithology

Sandstone

Limestone

Siltstone

Other (3,439 mi²)

Geologic Age

Pennsylvanian (323.6 Ma – 299.05 Ma ago)

Geologic Unit Label

PAm

Shale, siltstone, and mudstone; black, red, gray and green to variegated red and yellow in the southeastern areas of Ohio; clayey to sandy; nonbedded to thin bedded; locally calcareous. Sandstone, greenish-gray weathers to shades of yellow-brown, silty to locally conglomeratic; thin to massive to cross bedded; locally calcareous. Limestone, gray, micritic, clayey to silty, thin to medium bedded; generally more common in middle and lower portions of unit. Coal, banded, bituminous, thin to as much as 8 feet thick in central and northern areas, thinner to absent in southeastern Ohio. Lateral and vertical lithic variability and gradation common. Unit as much as 350 feet thick.

— USGS

Taxonomy

Classified As

Geologic Formation