Geologic Mapping in Central Pennsylvania

Bedrock geologic mapping is ongoing in the Ridge and Valley physiographic province of Pennsylvania.

Locations of recent and planned geologic mapping (green).

Ongoing and recent mapping in Central Pennsylvania.


Arnold Doden; David GoldGMRE, Inc.; Penn State UniversityBurnham, Barrville, McAlevys Fort, State College, and Julian quadrangles
Paul WashingtonIndependentNorthern portion of Mill Hall quadrangle
Peter SakDickinson CollegeSusquehanna River transect; Reward and Millersburg quadrangles
Thomas McElroyPa. Geological SurveyAllensville, Belleville, Lewistown, and Newton Hamilton quadrangles

See a related article in Pennsylvania Geology magazine (v. 36, no. 2) “Geology of Oz—aka the U.S. Route 22–522 Industrial Drive Interchange.”

Staff geologist Thomas McElroy investigates the Bald Eagle Formation in Central Pennsylvania          Closer view of Bald Eagle Formation rocks

Thomas McElroy investigates an outcrop of Bald Eagle Formation in central Pennsylvania.

Don Hoskins looks over an outcrop exposing the Antes shale-Colburn Formation contact.

Don Hoskins looks over an outcrop exposing the Antes shale-Coburn Formation contact.