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"The Conemaugh Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Carboniferous period. See also * List of fossiliferous stratigraphic units in Pennsylvania * Paleontology in Pennsylvania References * Category:Carboniferous geology of Pennsylvania Category:Carboniferous southern paleotropical deposits "
"The Duquesne Coal is a geologic formation in Pennsylvania. It preserves fossils dating back to the Carboniferous period. See also * List of fossiliferous stratigraphic units in Pennsylvania * Paleontology in Pennsylvania References * Category:Carboniferous geology of Pennsylvania "
"The Mercer Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Carboniferous period. See also * List of fossiliferous stratigraphic units in Pennsylvania * Paleontology in Pennsylvania References * Category:Carboniferous geology of Pennsylvania "