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| Long periods of weathering and erosion created these
"opferkessels" at Beam Rocks, Forbes State Forest, Somerset County. |
Ledges of Devonian sandstone overlook Adams Falls, Ricketts Glen State
Park, Luzerne County. |
Mega-ripple marks cover the surface of these near-vertical beds of
Antietam quartzite in Guilford Township, Franklin County. |
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| A group of teachers are collecting from the fossiliferous Mahantango
Formation in Monroe County. |
Limestone was burned to produce "quicklime" in these kilns at
Canoe Creek State Park, Blair County. |
Limestone quarry in Chester County. Limestone and dolomite have helped
make Pennsylvania a national leader in aggregate production. |
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| The "Whaleback" anticline in Bear Valley strip mine near
Shamokin, Pa is a natural laboratory for teaching structural geology. |
Kinzua Dam near Warren impounds the Allegheny Reservoir. Knowledge of site
geology is critical in choosing safe locations for dams. |
Pump jack on an oil well in the Allegheny National Forest, northwest
Pennsylvania. |
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| Tightly looping meanders of Conodoguinet Creek in eastern Cumberland
County. |
Interference ripples, or "tadpole nests," Rose Hill Shale (Clinton Group)
near Danville, Montour County. |
Slumped Homewood sandstone boulders resulting from glacial
lake drainage through the Slippery Rock Gorge, Lawrence County. |
