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Stone description: slate
| Wall Number | Country | State Sort descending | Classification | Source |
|---|---|---|---|---|
| 9RA30 | United States | New York | Argillite (Slate) | Hampton |
| 10RB30 | United States | New York | Argillite (Slate) | Middle Granville |
| 9RA17 | United States | Pennsylvania | Argillite (Slate) | Lynnport |
| 10L51 | United States | Pennsylvania | Argillite (Slate) | Lynnport |
| 10LB18 | United States | Pennsylvania | Argillite (Slate) | Lynnport |
| 10R51 | United States | Pennsylvania | Argillite (Slate) | Lynnport |