Plunketts Creek is in the southern edge of the dissected Allegheny Plateau , near the Allegheny Front . The underlying bedrock is sandstone and shale , mostly from the Mississippian sub @-@ period , with rock from the Devonian period in the north of the watershed . The northern edge of the Plunketts Creek drainage basin is formed by Burnetts Ridge and Popple Ridge . Plunketts Creek flow along the north side of Camp Mountain and , on turning south at Proctor , form a water gap between it and Cove Mountain ( to the west ) .