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Stone description: Lower carboniferous
| Wall Number | Country Sort ascending | State | Classification | Source |
|---|---|---|---|---|
| 5RA4 | United States | Ohio | Sandstone | Buena Vista |
| 14RB14 | United States | Iowa | Limestone | Le-Grand |
| 8RA20 | United States | Ohio | Sandstone | Elyria |
| 12RA36 | United States | Kentucky | Limestone | Garrett |
| 5RA6 | United States | Ohio | Sandstone | Howard Station Knox Co. |
| 14RB16 | United States | Iowa | Dolomite | Franklin |
| 8RA21 | United States | Ohio | Sandstone | Brooklyn |
| 12RB14 | United States | Missouri | Dolomite | St. Louis |
| 5RA8 | United States | Ohio | Sandstone | Greenfield |
| 14RB17 | United States | Iowa | Dolomite | Quarry, Marshall Co. |
| 8RB20 | United States | Ohio | Sandstone | Middleburg Twp. Cuyahoga Co. |
| 12RB16 | United States | Iowa | Dolomite | Humbolt |
| 5RA9 | United States | Ohio | Sandstone | Belleville |
| 14RB20 | United States | Iowa | Limestone | Winterset |
| 8RB21 | United States | Ohio | Sandstone | Amherst |
| 12RB21 | United States | Missouri | Limestone | Glencoe |
| 5RB1 | United States | Ohio | Sandstone | Amherst |
| 14RB21 | United States | Iowa | Limestone | Pella Station, Marion Co. |
| 9La10 | United States | Iowa | Limestone | Keosauque Station |
| 12RB4 | United States | Illinois | Limestone | Breese |
| 5RB3 | United States | Ohio | Sandstone | Bedford |
| 14RB23 | United States | Iowa | Limestone | Montour |
| 9LA21 | United States | Ohio | Sandstone | Lancaster |
| 13LA13 | United States | Iowa | Dolomite | Iowa Falls |
| 5RB5 | United States | Ohio | Sandstone | Brownhelm |
| 4LB12 | United States | Indiana | Limestone | Salem |
| 9LA22 | United States | Ohio | Sandstone | Logan |
| 13LA21 | United States | Iowa | Limestone | Quarry, Marshall Co. |
| 5RB8 | United States | Ohio | Sandstone | Independence |
| 4RB12 | United States | Indiana | Limestone | Salem |
| 9LA39 | United States | Indiana | Sandstone | French Lick Twp. |
| 13LA40 | United States | Ohio | Limestone | Newtonville |
| 6LA20 | United States | Ohio | Sandstone | Newark |
| 5LA1 | United States | Ohio | Sandstone | Mt. Gilead |
| 9LA40 | United States | Illinois | Sandstone | Pinckneyville |
| 13LA42 | United States | Illinois | Limestone | Quincy |
| 6La8 | United States | Pennsylvania | Sandstone | Altoona |
| 5LA10 | United States | Ohio | Sandstone | Sunbury |
| 9LA41 | United States | Illinois | Sandstone | Chester |
| 13LA43 | United States | Kentucky | Limestone | Grahampton |
| 6LB20 | United States | Ohio | Sandstone | Sunbury |