PA Department of Conservation & Natural ResourcesContact lines between Pennsylvania's bedrock geologic units mapped at 1:250,000 scale.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/0e0f3662dcca4c4294c744e6a1ff249a_1engPennsylvania Department of Conservation and Natural Resources Open Data PortalPublicBedrock Geology of Pennsylvania - Contacts (vector) [Pennsylvania]Web servicesPennsylvaniaLast Modified: 2026-01-08