Geology of Pennsylvania

Pennsylvania is enriched with many scenic geologic features and a strong geologic heritage. Survey geologists and cooperators are actively researching and mapping the geology across Pennsylvania, and are also actively researching the subsurface of Pennsylvania. Efforts are being made to continually provide information on the Survey's investigations. Selected research geology abstracts and papers from conferences and publications also are posted here.

Pennsylvania possesses a wide range of landforms from mountains to lowlands. To learn more about the state's landforms and their geologic origins, select our web page on landforms. There are many sites in Pennsylvania that you may visit to view geologic features and to learn about the geologic heritage of our state. These sites include State Parks where exceptional geologic features are preserved. To learn about geologic features at Pennsylvania's State Parks, click on Trail of Geology, which includes guides to selected state parks, or take a virtual tour on one of our field trips

Devils Den




2007 Field Conference of Pennsylvania Geologists, Stop 6


Field Trips

The best way to see and learn about geology is in the field. Learn more about places to view geologic features and find selected field trip guidebooks here.




They may appear like creatures from another planet but many fossils are similar to organisms found in present-day ecosystems.




About 30% of Pennsylvania was covered by glaciers during the Ice Age.  Learn more about Pennsylvania's glaciation, and find links to publications, related web sites, and a glacial photo gallery.


Ticklish Rock


Heritage Sites

Geoheritage features are significant exemplary examples of geology that display the unique natural and historic heritage of our Commonwealth.

Warriors Path State Park



Learn about the variety of landscapes in Pennsylvania and how they are controlled by the underlying geology.




PA Geology
(The Magazine)

Free publication of the Bureau of Topographic and Geologic Survey




Pennyslvania’s subsurface geology provides much insight into the geologic history of our region, as well as offers many opportunities for energy resource development.  Click here to learn more.