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Stone description: dark gray
| Wall Number | Country | State | Classification Sort descending | Source |
|---|---|---|---|---|
| 6LB14 | United States | Pennsylvania | Diabase | Collins Station Lancaster Co. |
| 11RB31 | United States | Virginia | Diabase | Leesburg |
| 5LA33 | United States | Minnesota | Diabase | Duluth |
| 6Lb19 | United States | Pennsylvania | Diabase | Jacksonwald |
| 6RB43 | United States | New Jersey | Diabase | Rocky Hill |
| 5RB16 | United States | Massachusetts | Diabase | E. Longmeadow |
| 6LB43 | United States | New Jersey | Diabase | Lambertville |
| 8LA23 | United States | Massachusetts | Diabase | Medford |
| 11Lb36 | United States | Virginia | Diabase | Catlett's Station |
| 5LB25 | United States | Maine | Diabase | Addison Point |
| 5RB27 | United States | Maine | Diabase | Addison |
| 8LA27 | United States | Maine | Diabase | Addison Point |
| 5RB35 | United States | Connecticut | Diabase | New Haven |
| 10LA30 | United States | Maine | Diabase | Vinal Haven |
| 6RB10 | United States | Pennsylvania | Diabase | St. Peters |
| 10LA42 | United States | New Jersey | Diabase | Jersey City |
| 6RB19 | United States | Pennsylvania | Diabase | Reading |
| 10RB49 | United States | Wisconsin | Quartz | Marquette |
| 10LB23 | United States | Massachusetts | Gneiss | Becket |
| 6LB18 | United States | Pennsylvania | Gneiss | Philadelphia |
| 5LA34 | United States | Connecticut | Gneiss | Middletown |
| 5La35 | United States | Connecticut | Gneiss | N. Bridgeport |
| 6LB29 | United States | New York | Gneiss | Hastings |
| 7LB17 | United States | Pennsylvania | Gneiss | Chester |
| 5LA43 | United States | New Hampshire | Gneiss | Sunapee |
| 7LB33 | United States | Connecticut | Gneiss | Haddam |
| 1L1 | United States | Connecticut | Gneiss | Milford |
| 8RB38 | United States | Maryland | Gneiss | Ilchester |
| 5LB21 | United States | North Carolina | Gneiss | Henry's Station McDowel Co. |
| 6RA25 | United States | Maine | Gneiss | Turner |
| 5LB22 | United States | North Carolina | Gneiss | Alexander |
| 6RA40 | United States | Maryland | Gneiss | Ellicott City |
| 6RA46 | United States | Michigan | Gneiss | Vulcan |
| 5RB46 | United States | Delaware | Gneiss | Wilmington |
| 4LB16 | United States | Delaware | Gneiss | Brandywine |
| 6LA36 | United States | Connecticut | Gneiss | Greenwich |
| 6RB17 | United States | Pennsylvania | Gneiss | Philadelphia |
| 5RA31 | United States | Georgia | Gneiss | Atlanta |
| 6LA39 | United States | Massachusetts | Gneiss | Monson |
| 5RA37 | Mexico | Andesite | Hildalgo State | |
| 10RB42 | United States | Oregon | Basalt | Albany |
| 5RA29 | United States | California | Basalt | Petaluma |
| 11RB30 | United States | Virginia | Schist | Farquier Co. |
| 8RA27 | United States | Maine | Schist | Knightsville |
| 5LA26 | Austria | Pitchstone | Castleruth | |
| 5LB34 | United States | Minnesota | Gabbro | Duluth |