| Country | State | Classification | Source | WallNo | Centennial | Commercial | Location | surroundPic |
| United States | Pennsylvania | Quartzite | Mapleton | 7La18 | 26171 | y | Front Face (South) | Dscf0134.jpg |
Description |
| light gray |
| fine grain |
| compact |
| Upper Silurian |
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No 7LA18 is:
| Picture of the Archive Stone: |
Actual Picture from the Stone Wall:
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