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Stone description: Lower carboniferous
| Wall Number | Country | State | Classification Sort ascending | Source |
|---|---|---|---|---|
| 13LA43 | United States | Kentucky | Limestone | Grahampton |
| 14LB22 | United States | Iowa | Limestone | Dudley Sta. Wapello Co. |
| 12LB21 | United States | Missouri | Limestone | St. Louis |
| 13LB20 | United States | Iowa | Limestone | Mt. Pleasant |
| 14Lb46 | United States | Kentucky | Limestone | Princeton |
| 12LB36 | United States | Indiana | Limestone | Salem |
| 13LB45 | United States | Kentucky | Limestone | Green Co. |
| 9LB11 | United States | Iowa | Limestone | Durham Sta. Marion Co. |
| 10LA20 | United States | Iowa | Limestone | Iowa Falls |
| 12RA1 | United States | Indiana | Limestone | Bedford |
| 8RA10 | United States | Illinois | Limestone | Chester |
| 9LB14 | United States | Iowa | Limestone | Fairfield |
| 10La21 | United States | Missouri | Limestone | Springfield |
| 12RA32 | United States | Indiana | Limestone | Salem |
| 14RA21 | United States | Iowa | Limestone | Washington |
| 8RA13 | United States | Indiana | Limestone | Bedford |
| 12RA33 | United States | Indiana | Limestone | Spencer |
| 13RA20 | United States | Iowa | Limestone | Sigourney Station, Keokuk Co. |
| 14RA22 | United States | Iowa | Limestone | Winterset |
| 8RA15 | United States | Indiana | Limestone | Putnamville |
| 12RA34 | United States | Indiana | Limestone | Oakalla |
| 13RA41 | United States | Kentucky | Limestone | Princeton |
| 8RA16 | United States | Indiana | Limestone | Ellettsville |
| 12RA36 | United States | Kentucky | Limestone | Garrett |
| 13RA42 | United States | Kentucky | Limestone | Princeton |
| 14RB14 | United States | Iowa | Limestone | Le-Grand |
| 7RA14 | United States | Pennsylvania | Limestone | Connellsville |
| 9RA10 | United States | Iowa | Limestone | Ottumwa |
| 13RB39 | United States | Illinois | Limestone | Columbia |
| 9RA11 | United States | Iowa | Limestone | Sigourney Station, Keokuk Co. |
| 11LB20 | United States | Iowa | Limestone | Iowa Falls |
| 13RB40 | United States | Illinois | Limestone | Chester |
| 12RB21 | United States | Missouri | Limestone | Glencoe |
| 13RB42 | United States | Indiana | Limestone | Bedford |
| 14RB20 | United States | Iowa | Limestone | Winterset |
| 11RA19 | United States | Iowa | Limestone | Montour |
| 12RB4 | United States | Illinois | Limestone | Breese |
| 13RB45 | United States | Kentucky | Limestone | Dennis |
| 14RB21 | United States | Iowa | Limestone | Pella Station, Marion Co. |
| 9La10 | United States | Iowa | Limestone | Keosauque Station |
| 9RA9 | United States | Iowa | Limestone | Tracey Station, Marion Co. |