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| Carboniferous - Dunkard formation; Monongahela formation; Conemaugh formation; Saltsburg sandstone; Conemaugh formation; Pottsville sandstone; Mauch Chunk formation; Greenbrier limestone; Mauch Chunk formation; Pocono sandstone (1) |
| Geology -- Pennsylvania -- Allegheny County -- Maps (1) |
| Geology -- Pennsylvania -- Fayette County -- Maps (1) |
| Geology -- Pennsylvania -- Washington County -- Maps (1) |
| Geology -- Pennsylvania -- Westmoreland County -- Maps (1) |
| Geology -- United States --Maps (1) |
| Neogene - Carmichael clay (1) |