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Stone description: medium grain
| Wall Number | Country | State Sort descending | Classification | Source |
|---|---|---|---|---|
| 6RA31 | United States | California | Sandstone | Haywards |
| 5RA30 | United States | California | Granite | Penryn |
| 1L13 | United States | Colorado | Marble | Marble |
| 1R13 | United States | Colorado | Marble | Marble |
| 5RA32 | United States | Colorado | Granite | Lawson |
| 6rb32 | United States | Colorado | Granite | Georgetown |
| 14LA23 | United States | Colorado | Marble | Marble |
| 14LA24 | United States | Colorado | Marble | Marble |
| 7La33 | United States | Connecticut | Sandstone | Cromwell |
| 1R1 | United States | Connecticut | Granite | Leete Isl. |
| 7La9 | United States | Connecticut | Limestone | Shelterville |
| 8RB35 | United States | Connecticut | Sandstone | Portland |