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Stone description: Lower carboniferous
| Wall Number Sort ascending | Country | State | Classification | Source |
|---|---|---|---|---|
| 13RB45 | United States | Kentucky | Limestone | Dennis |
| 13RB42 | United States | Indiana | Limestone | Bedford |
| 13RB40 | United States | Illinois | Limestone | Chester |
| 13RB39 | United States | Illinois | Limestone | Columbia |
| 13RA42 | United States | Kentucky | Limestone | Princeton |
| 13RA41 | United States | Kentucky | Limestone | Princeton |
| 13RA20 | United States | Iowa | Limestone | Sigourney Station, Keokuk Co. |
| 13RA15 | United States | Iowa | Dolomite | Ames Station Story Co. |
| 13RA13 | United States | Iowa | Dolomite | Humbolt |
| 13LB45 | United States | Kentucky | Limestone | Green Co. |
| 13LB20 | United States | Iowa | Limestone | Mt. Pleasant |
| 13LA43 | United States | Kentucky | Limestone | Grahampton |
| 13LA42 | United States | Illinois | Limestone | Quincy |
| 13LA40 | United States | Ohio | Limestone | Newtonville |
| 13LA21 | United States | Iowa | Limestone | Quarry, Marshall Co. |
| 13LA13 | United States | Iowa | Dolomite | Iowa Falls |
| 12RB4 | United States | Illinois | Limestone | Breese |
| 12RB21 | United States | Missouri | Limestone | Glencoe |
| 12RB16 | United States | Iowa | Dolomite | Humbolt |
| 12RB14 | United States | Missouri | Dolomite | St. Louis |
| 12RA36 | United States | Kentucky | Limestone | Garrett |
| 12RA34 | United States | Indiana | Limestone | Oakalla |
| 12RA33 | United States | Indiana | Limestone | Spencer |
| 12RA32 | United States | Indiana | Limestone | Salem |
| 12RA1 | United States | Indiana | Limestone | Bedford |
| 12LB36 | United States | Indiana | Limestone | Salem |
| 12LB21 | United States | Missouri | Limestone | St. Louis |
| 12LB17 | United States | Iowa | Dolomite | Dakota Sta. |
| 12LB12 | United States | Kentucky | Dolomite | Louisville |
| 12LA35 | United States | Indiana | Limestone | Spencer |
| 12LA15 | United States | Iowa | Dolomite | Marshalltown |
| 11RA21 | United States | Missouri | Limestone | St. Louis |
| 11RA19 | United States | Iowa | Limestone | Montour |
| 11RA14 | United States | Iowa | Dolomite | Lansing |
| 11LB20 | United States | Iowa | Limestone | Iowa Falls |
| 11LB15 | United States | Missouri | Dolomite | Sedalia |
| 10RB36 | United States | Missouri | Sandstone | St. Genevieve |
| 10RB22 | United States | Ohio | Sandstone | Warren |
| 10LB20 | United States | Ohio | Sandstone | Lancaster |
| 10La21 | United States | Missouri | Limestone | Springfield |
| 10LA20 | United States | Iowa | Limestone | Iowa Falls |