Country State Classification Source WallNo Centennial Commercial Location surroundPic
United States Pennsylvania Limestone Mertztown 8RB17 37879 n Front Face (South) Dscf0268_2.jpg
No 8RB17 is:

Description
dark blue gray
medium grain
compact
Lower Silurian


Picture of the Archive Stone:
/archive/front/8rb17.jpg		 Actual Picture from the Stone Wall: /mid2000/8rb17.jpg (63575 bytes)