Pottsville Formation
Geology
Group: Allegheny
Members: Lower Mercer (1), Lower Mercer Shale (2), Mercer Shale (1)
Lithologies: "shale" (4), "limestone" (4)
Paleoenvironments: carbonate indet. (1), shallow subtidal indet. (3)
Age range: Atokan or 318.60000 to 312.80000 Ma