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Stone description: roofing
| Wall Number Sort descending | Country | State | Classification | Source |
|---|---|---|---|---|
| 10RB30 | United States | New York | Argillite (Slate) | Middle Granville |
| 6RA41 | United States | Maryland | Argillite (Slate) | Nr. Cardiff |
| 9LA31 | United States | New York | Argillite (Slate) | Granville |
| 9RA30 | United States | New York | Argillite (Slate) | Hampton |