Hike among the boulders at McConnells Mill. Activities will include a geology themed guided hike in the Slippery Rock Gorge while learning how rocks and minerals tied into our industrial past. The Slippery Rock Gorge is designated a National Natural Landmark, come and discover for yourself. Wear sturdy footwear, dress for the weather, and bring your own water and snacks. Meet in the Kildoo Picnic Area.