Bureau of Topographic and Geologic Survey


Marcellus and other Organic-Rich Shale

Research on the Marcellus, Utica and other organic rich shales.

Hickory Run boulder field

What's New

This section features new information and publications on the bureau's website.


New Series Makes It Easy to Explore
Geology in Pennsylvania  

The Pennsylvania Geological Survey is pleased to introduce the Trail of Geology, a new series that includes well-illustrated publications of a sight-seeing nature. By gathering together all of the reports from the Survey’s former park guide series, a few previously published trail guides, and single-page summaries for a large group of outstanding geologic features, we are able to begin the series with over 100 publications!

Examples of those three types of publications include the following:

  • Read about and explore the geology in one of our parks, such as Moraine and McConnells Mill State Parks (TG 16–004.0), Valley Forge National Historical Park (TG 16–008.0), or Nottingham County Park (TG
  • Follow a trail guide. For example, hop on a bike and tour the rocks and ruins along the Lehigh Gorge (TG
    16–114.0), or get in a kayak, canoe, or inner tube, and paddle or float to the geologic outcrops along the Yellow Breeches Creek (TG 16–116.0).    
  • Drive to an outstanding geologic site. GPS coordinates and location maps make it easy. You might decide to walk through a rock city (TG 16–032.0), view and learn about the Delaware Water Gap (TG 16–046.0), or head back in time at the Meadowcroft Rockshelter (TG 16–077.0). 

Keep that resolution, get off your duff and let one of our publications guide you along the trail of geology.