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Stone description: dark gray
| Wall Number Sort ascending | Country | State | Classification | Source |
|---|---|---|---|---|
| 13RB8 | United States | Pennsylvania | Limestone | Morrell |
| 13RB5 | United States | New York | Limestone | Kingston |
| 13RB42 | United States | Indiana | Limestone | Bedford |
| 13RA26 | Canada | Limestone | Montreal region | |
| 13LB45 | United States | Kentucky | Limestone | Green Co. |
| 13LB12 | United States | New Jersey | Dolomite | Newton |
| 13La46 | United States | Kentucky | Limestone | Livingstone |
| 13LA43 | United States | Kentucky | Limestone | Grahampton |
| 13LA35 | Spain | Limestone | Ricla, Saragossa | |
| 13La1 | United States | Vermont | Limestone | Isle La Motte |
| 12RQ | United States | New York | Sandstone | South Unadilla |
| 12RB5 | United States | Tennessee | Limestone | Murfreesborough |
| 12RB4 | United States | Illinois | Limestone | Breese |
| 12RB24 | United States | Tennessee | Limestone | Lebanon Pike |
| 12RB23 | United States | Kansas | Limestone | Oswego |
| 12RB17 | United States | Iowa | Dolomite | Garrison |
| 12RB13 | United States | Ohio | Dolomite | Holmes Twp. Crawford C. |
| 12RA17 | United States | Iowa | Dolomite | Garrison |
| 12RA12 | United States | Ohio | Dolomite | Lexington |
| 12LB7 | United States | New York | Limestone | Le Roy |
| 12LB13 | United States | Montana | Marble | Helena |
| 12LA7 | United States | New York | Limestone | Canajoharie |
| 12LA22 | United States | Missouri | Limestone | Pleasant Hill |
| 11RB31 | United States | Virginia | Diabase | Leesburg |
| 11RB30 | United States | Virginia | Schist | Farquier Co. |
| 11RB14 | United States | Missouri | Dolomite | Hermann |
| 11RA6 | United States | New York | Limestone | Buffalo |
| 11RA22 | United States | Missouri | Limestone | Neosho |
| 11RA16 | United States | Iowa | Dolomite | Osage Sta. |
| 11LB7 | United States | Pennsylvania | Dolomite | Reading |
| 11LB38 | United States | Virginia | Granite | Fredericksburg |
| 11Lb36 | United States | Virginia | Diabase | Catlett's Station |
| 11LB15 | United States | Missouri | Dolomite | Sedalia |
| 11LA39 | United States | Tennessee | Sandstone | Cater's Creek Davidson Co. |
| 10RB49 | United States | Wisconsin | Quartz | Marquette |
| 10RB42 | United States | Oregon | Basalt | Albany |
| 10RB23 | United States | Massachusetts | Granite | Framingham |
| 10rb16 | Argentina | Marble | Unkown | |
| 10R51 | United States | Pennsylvania | Argillite (Slate) | Lynnport |
| 10LB23 | United States | Massachusetts | Gneiss | Becket |
| 10LB18 | United States | Pennsylvania | Argillite (Slate) | Lynnport |
| 10LA7 | United States | New York | Limestone | Onondaga |
| 10LA5 | United States | Wisconsin | Dolomite | Oshkosh |
| 10LA42 | United States | New Jersey | Diabase | Jersey City |
| 10LA30 | United States | Maine | Diabase | Vinal Haven |
| 10L51 | United States | Pennsylvania | Argillite (Slate) | Lynnport |