Shel 52 2. 23. At the bridge south of the Blenden Mine, south of Andover. The Cambrian sandstone right here to lie on the east side of the little knoll along the road just S. E. of the bridge, over the little stream. However neither Archaean nor Cambrian is shown here. I did not try to find Cambrian far to the south since I thought this station 23 was far enough S. to prove the Archaean nature of the crystalline limestones at the Blenden Mine.