from the U.S. Geological Survey.

Pennsylvania Department of Conservation and Natural Resources.

Mindat.org is the largest mineral database and mineralogy reference website on the Internet. This site contains worldwide data on minerals, mineral collecting, mineral localities and other mineralogical information.

Government publications and reports on all aspects of geology.

GSA’s mission is to be a leader in advancing the geosciences, enhancing the professional growth of its members, and promoting the geosciences in the service to humankind and stewardship of the Earth.

Created by Carnegie Mellon University

Produced by emeritus faculty member Dr. Edward Cotter, text and graphics describing the geology of our region.