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The Geology of Pennsylvania consists of six distinct physiographic provinces, three of which are subdivided into different sections. Each province has its own economic advantages and geologic hazards and plays an important role in shaping everyday life in the state.
The following is a list of the mapped bedrock units in Pennsylvania. The rocks are listed in stratigraphic order. The rocks are listed in stratigraphic order. [ 1 ]
The land on either side of the Connecticut River Valley is less suitable for farmlands. The eastern section holds the shallow Proto-North American Terrane while the western section contains the Iapetos and Avalonian Terranes , which still holds remnants of glacial till and lack the soft fluvial sediments so prominent in the Connecticut River ...
The Devonian Old Port Formation is a mapped bedrock unit in Pennsylvania, USA.Details of the type section and of stratigraphic nomenclature for this unit as used by the U.S. Geological Survey are available on-line at the National Geologic Map Database. [2]
The Triassic Stockton Formation is a mapped bedrock unit in Pennsylvania, New Jersey, and New York. It is named after Stockton, New Jersey , where it was first described. It is laterally equivalent to the New Oxford Formation in the Gettysburg Basin of Pennsylvania and Maryland .
The Pennsylvanian Pottsville Formation is a mapped bedrock unit in Pennsylvania, western Maryland, West Virginia, Ohio, and Alabama.It is a major ridge-former in the Ridge-and-Valley Appalachians of the eastern United States. [3]
Red shale and siltstone occur in the lower part of the formation. The formation has a thickness between 450 feet and 600 feet in Maryland and 445 to 620 feet in Pennsylvania. [2] The Wills Creek forms the bedrock of the valley around and to the east of Lewistown, Pennsylvania. [3]
The Silurian Bloomsburg Formation is a mapped bedrock unit in Pennsylvania, New Jersey, New York and Maryland. It is named for the town of Bloomsburg, Pennsylvania , in which it was first described. The Bloomsburg marked the first occurrence of red sedimentary rocks in the Appalachian Basin .