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Stone description: blue-black
| Wall Number Sort descending | Country | State | Classification | Source |
|---|---|---|---|---|
| 10RB17 | Spain | Limestone | Ricla, Saragossa | |
| 10RB20 | United States | Pennsylvania | Argillite (Slate) | Slatington |
| 10RB21 | United States | Pennsylvania | Argillite (Slate) | Slatington |
| 11RB37 | United States | New Jersey | Sandstone | Woodsville |
| 14RB9 | United States | Pennsylvania | Dolomite | Chambersburg |
| 5RA44 | United States | Vermont | Argillite (Slate) | Castleton |
| 6La45 | United States | Michigan | Argillite (Slate) | Arvon |
| 6LB15 | United States | Pennsylvania | Argillite (Slate) | Slatington |
| 6RA41 | United States | Maryland | Argillite (Slate) | Nr. Cardiff |
| 6RB15 | United States | Pennsylvania | Argillite (Slate) | Bangor |
| 7LA17 | United States | Pennsylvania | Argillite (Slate) | Slatington |
| 7RA17 | United States | Pennsylvania | Argillite (Slate) | Slatedale |
| 8La18 | United States | Pennsylvania | Argillite (Slate) | Bangor |
| 9Lb19 | United States | Pennsylvania | Argillite (Slate) | Chapman's Station |
| 9RB4 | United States | North Carolina | Marble | Valley Town |