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Stone description: Sub-carboniferous
| Wall Number | Country | State | Classification | Source Sort descending |
|---|---|---|---|---|
| 13RA21 | United States | Iowa | Limestone | Bentonsport |
| 9LA9 | United States | Iowa | Limestone | Burlington |
| 9LB13 | United States | Iowa | Limestone | Burlington |
| 7RA19 | United States | Ohio | Sandstone | Carrollton |
| 5LA14 | United States | Ohio | Sandstone | Columbus |
| 8RB19 | United States | Pennsylvania | Sandstone | Corry |
| 9RA45 | Canada | Sandstone | Dorchester, New Brunswick | |
| 6RB2 | United States | Pennsylvania | Sandstone | Franklin |
| 9RA19 | United States | Pennsylvania | Sandstone | Franklin |
| 13RA43 | United States | Kentucky | Limestone | Hopkinsville |
| 13RB43 | United States | Kentucky | Limestone | Litchfield |
| 13RA44 | United States | Kentucky | Limestone | Pilot Knob |
| 13RB15 | United States | Iowa | Dolomite | Quarry, Marshall Co. |
| 6LA5 | United States | Pennsylvania | Sandstone | Scranton |
| 9RA20 | United States | Pennsylvania | Sandstone | Uniontown |