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Stone description: roofing and tile slate
| Wall Number Sort descending | Country | State | Classification | Source |
|---|---|---|---|---|
| 10RB20 | United States | Pennsylvania | Argillite (Slate) | Slatington |
| 10RB21 | United States | Pennsylvania | Argillite (Slate) | Slatington |
| 6LB15 | United States | Pennsylvania | Argillite (Slate) | Slatington |
| 7LA17 | United States | Pennsylvania | Argillite (Slate) | Slatington |
| 7RA17 | United States | Pennsylvania | Argillite (Slate) | Slatedale |