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Stone description: Lower carboniferous
| Wall Number | Country Sort descending | State | Classification | Source |
|---|---|---|---|---|
| 5LB6 | United States | Ohio | Sandstone | Newark |
| 9RB13 | United States | Iowa | Limestone | Conrad |
| 14LA20 | United States | Iowa | Limestone | Mt. Pleasant |
| 14LB20 | United States | Iowa | Limestone | Knoxville |
| 8LA15 | United States | Indiana | Limestone | Greenscastle |
| 12LA35 | United States | Indiana | Limestone | Spencer |
| 5LB7 | United States | Ohio | Sandstone | N. Bloomfield |
| 9RB20 | United States | Ohio | Sandstone | Harmer |
| 14LB21 | United States | Iowa | Limestone | Dudley Sta. Wapello Co. |
| 8LA20 | United States | Ohio | Sandstone | Portsmouth |
| 12LB12 | United States | Kentucky | Dolomite | Louisville |
| 5RA10 | United States | Ohio | Sandstone | Berea |
| 9RB39 | United States | Indiana | Sandstone | Paoli |
| 14LB22 | United States | Iowa | Limestone | Dudley Sta. Wapello Co. |
| 8LA31 | United States | Kentucky | Sandstone | Johnson Co. |
| 12LB17 | United States | Iowa | Dolomite | Dakota Sta. |
| 5RA11 | United States | Ohio | Sandstone | Lithopolis |
| 14Lb46 | United States | Kentucky | Limestone | Princeton |
| 8LB20 | United States | Ohio | Sandstone | Berea |
| 12LB21 | United States | Missouri | Limestone | St. Louis |
| 5RA12 | United States | Ohio | Sandstone | Euclid |
| 14RA14 | United States | Iowa | Dolomite | Ames Station Story Co. |
| 8LB31 | United States | Kentucky | Sandstone | Cloveport |
| 12LB36 | United States | Indiana | Limestone | Salem |
| 5RA16 | United States | Ohio | Sandstone | Leesville |
| 14RA16 | United States | Iowa | Dolomite | Franklin |
| 8RA10 | United States | Illinois | Limestone | Chester |
| 12RA1 | United States | Indiana | Limestone | Bedford |
| 5RA18 | United States | Ohio | Sandstone | E. Cleveland |
| 14RA21 | United States | Iowa | Limestone | Washington |
| 8RA13 | United States | Indiana | Limestone | Bedford |
| 12RA32 | United States | Indiana | Limestone | Salem |
| 5RA19 | United States | Ohio | Sandstone | Mansfield |
| 14RA22 | United States | Iowa | Limestone | Winterset |
| 8RA15 | United States | Indiana | Limestone | Putnamville |
| 12RA33 | United States | Indiana | Limestone | Spencer |
| 5RA2 | United States | Ohio | Sandstone | Iberia |
| 14RA3 | United States | Illinois | Dolomite | Saline |
| 8RA16 | United States | Indiana | Limestone | Ellettsville |
| 12RA34 | United States | Indiana | Limestone | Oakalla |
| 5RA4 | United States | Ohio | Sandstone | Buena Vista |