Link to PA Geological Survey

Pennsylvania’s Trail of Geology

Park Guides


  • Lehigh Gorge State Park Open-File Report 98–03, Rocks and ruins of the “Upper Grand”—An illustrated trail guide to the geology and historical archeology of Lehigh Gorge State Park.
  • Point State Park Older brochure, prepared for the Pittsburgh Geological Society by the University of Pittsburgh—features the structure of “The Point.”

Trail Guide

Garrett-to-Rockwood section of the Allegheny Highlands Trail —Prepared by the Pennsylvania Geological Survey in cooperation with the Somerset County Rails-to-Trails Association and the Somerset County Parks and Recreation Board—diverse geologic topics (formation of rock units, structure and age of rocks, types of fossils, and more) along a 7-mile section of the Allegheny Highlands Trail in Somerset County.