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Stone description: Lower carboniferous
| Wall Number | Country | State Sort ascending | Classification | Source |
|---|---|---|---|---|
| 14LB22 | United States | Iowa | Limestone | Dudley Sta. Wapello Co. |
| 14RA14 | United States | Iowa | Dolomite | Ames Station Story Co. |
| 14RA16 | United States | Iowa | Dolomite | Franklin |
| 14RA21 | United States | Iowa | Limestone | Washington |
| 14RA22 | United States | Iowa | Limestone | Winterset |
| 14RB14 | United States | Iowa | Limestone | Le-Grand |
| 14RB16 | United States | Iowa | Dolomite | Franklin |
| 14RB17 | United States | Iowa | Dolomite | Quarry, Marshall Co. |
| 12RB16 | United States | Iowa | Dolomite | Humbolt |
| 14RB20 | United States | Iowa | Limestone | Winterset |
| 14RB21 | United States | Iowa | Limestone | Pella Station, Marion Co. |
| 9La10 | United States | Iowa | Limestone | Keosauque Station |
| 14RB23 | United States | Iowa | Limestone | Montour |
| 13LA13 | United States | Iowa | Dolomite | Iowa Falls |
| 13LA21 | United States | Iowa | Limestone | Quarry, Marshall Co. |
| 9LB40 | United States | Indiana | Sandstone | French Lick Twp. |
| 13RB42 | United States | Indiana | Limestone | Bedford |
| 8LA13 | United States | Indiana | Limestone | Fort Ritner |
| 12LA35 | United States | Indiana | Limestone | Spencer |
| 8LA15 | United States | Indiana | Limestone | Greenscastle |
| 9RB39 | United States | Indiana | Sandstone | Paoli |
| 12LB36 | United States | Indiana | Limestone | Salem |
| 12RA1 | United States | Indiana | Limestone | Bedford |
| 12RA32 | United States | Indiana | Limestone | Salem |
| 8RA13 | United States | Indiana | Limestone | Bedford |
| 8RA15 | United States | Indiana | Limestone | Putnamville |
| 12RA33 | United States | Indiana | Limestone | Spencer |
| 8RA16 | United States | Indiana | Limestone | Ellettsville |
| 12RA34 | United States | Indiana | Limestone | Oakalla |
| 4LB12 | United States | Indiana | Limestone | Salem |
| 4RB12 | United States | Indiana | Limestone | Salem |
| 9LA39 | United States | Indiana | Sandstone | French Lick Twp. |
| 9LA40 | United States | Illinois | Sandstone | Pinckneyville |
| 13LA42 | United States | Illinois | Limestone | Quincy |
| 9LA41 | United States | Illinois | Sandstone | Chester |
| 9LA42 | United States | Illinois | Sandstone | Chester |
| 13RB39 | United States | Illinois | Limestone | Columbia |
| 13RB40 | United States | Illinois | Limestone | Chester |
| 8RA10 | United States | Illinois | Limestone | Chester |
| 14RA3 | United States | Illinois | Dolomite | Saline |
| 12RB4 | United States | Illinois | Limestone | Breese |