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Stone description: Lower carboniferous
| Wall Number | Country | State | Classification | Source Sort ascending |
|---|---|---|---|---|
| 14RB16 | United States | Iowa | Dolomite | Franklin |
| 8LA13 | United States | Indiana | Limestone | Fort Ritner |
| 9LB14 | United States | Iowa | Limestone | Fairfield |
| 5RA12 | United States | Ohio | Sandstone | Euclid |
| 7RA20 | United States | Ohio | Sandstone | Elyria |
| 8RA20 | United States | Ohio | Sandstone | Elyria |
| 8RA16 | United States | Indiana | Limestone | Ellettsville |
| 5RA18 | United States | Ohio | Sandstone | E. Cleveland |
| 9LB11 | United States | Iowa | Limestone | Durham Sta. Marion Co. |
| 14LB21 | United States | Iowa | Limestone | Dudley Sta. Wapello Co. |
| 14LB22 | United States | Iowa | Limestone | Dudley Sta. Wapello Co. |
| 13RB45 | United States | Kentucky | Limestone | Dennis |
| 12LB17 | United States | Iowa | Dolomite | Dakota Sta. |
| 9RB13 | United States | Iowa | Limestone | Conrad |
| 7RA14 | United States | Pennsylvania | Limestone | Connellsville |
| 13RB39 | United States | Illinois | Limestone | Columbia |
| 6LB30 | United States | Kentucky | Sandstone | Cloveport |
| 7RA28 | United States | Kentucky | Sandstone | Cloveport |
| 8LB31 | United States | Kentucky | Sandstone | Cloveport |
| 9LA41 | United States | Illinois | Sandstone | Chester |
| 9LA42 | United States | Illinois | Sandstone | Chester |
| 13RB40 | United States | Illinois | Limestone | Chester |
| 8RA10 | United States | Illinois | Limestone | Chester |
| 5RA4 | United States | Ohio | Sandstone | Buena Vista |
| 5RB5 | United States | Ohio | Sandstone | Brownhelm |
| 8RA21 | United States | Ohio | Sandstone | Brooklyn |
| 12RB4 | United States | Illinois | Limestone | Breese |
| 5RA10 | United States | Ohio | Sandstone | Berea |
| 8LB20 | United States | Ohio | Sandstone | Berea |
| 5RA9 | United States | Ohio | Sandstone | Belleville |
| 13RB42 | United States | Indiana | Limestone | Bedford |
| 12RA1 | United States | Indiana | Limestone | Bedford |
| 8RA13 | United States | Indiana | Limestone | Bedford |
| 5RB3 | United States | Ohio | Sandstone | Bedford |
| 6RB20 | United States | Ohio | Sandstone | Amherst |
| 7RB19 | United States | Ohio | Sandstone | Amherst |
| 8RB21 | United States | Ohio | Sandstone | Amherst |
| 5RB1 | United States | Ohio | Sandstone | Amherst |
| 13RA15 | United States | Iowa | Dolomite | Ames Station Story Co. |
| 14RA14 | United States | Iowa | Dolomite | Ames Station Story Co. |
| 6La8 | United States | Pennsylvania | Sandstone | Altoona |