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Stone classification: Basalt
| Wall Number | Country Sort descending | State | Source | Description |
|---|---|---|---|---|
| 10RB34 | Mexico | Mexico State | dull-red, very vesicular | |
| 5LB36 | Mexico | Puebla State | cut from the same block as 5RB37, nearly black, fine grain, coarsely vesicular | |
| 5RB37 | Mexico | Puebla State | nearly black, fine grain, coarsely vesicular | |
| 10RB42 | United States | Oregon | Albany | dark gray, medium grain, compact |
| 5LB29 | United States | California | Bridgeport | gray, fine grain, compact |
| 5RA29 | United States | California | Petaluma | dark gray, fine grain, compact |
| 8RA42 | United States | Oregon | Clackamas Station Clackamas Co | gray, fine grain, porous |