Connoquenessing Sandstone


The intact ledges at the mill dam are at the top of the Connoquenessing Sandstone, about 40 feet below the base of the Homewood, and directly beneath the Mercer shales and coals (see cross section in bedrock section). There are few easily accessible outcrops of the Connoquenessing Sandstone. Most, like the Slippery Rock, are deep in the gorge near stream level. This one, at the mill dam, is the most accessible.