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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 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.
Paul E. Olsen, 1980 [1] The Passaic Formation is a mapped bedrock unit in Pennsylvania , New Jersey , and New York . It was previously known as the Brunswick Formation since it was first described in the vicinity of New Brunswick, New Jersey .
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] Current nomenclature usage by U.S. Geological Survey restricts the name Old Port Formation to Pennsylvania, but correlative units are present in adjacent states. [3]
The Gatesburg Formation is a geologic formation in Pennsylvania. [4] It preserves fossils dating back to the Cambrian period . The formation is described by Berg and others as gray dolomite , limestone , and sandstone .
The Llewellyn is defined as a gray, fine- to coarse-grained sandstone, siltstone, shale, conglomerate, and anthracite coal in repetitive sequences. Although gray (light to dark) is the dominant color, other colors described include: buff, dark to light brown, and black. [2]
The Gettysburg Formation is a mapped bedrock unit consisting primarily of sandstones, conglomerates, and shales.. The Gettysburg Formation was first described in the Gettysburg area of Adams County, Pennsylvania in 1929, [1] and over the following decade was mapped in adjacent York County, Pennsylvania [4] and Frederick County, Maryland. [5]
The Ordovician Martinsburg Formation (Om) is a mapped bedrock unit in Pennsylvania, New Jersey, Maryland, Virginia, and West Virginia.It is named for the town of Martinsburg, West Virginia for which it was first described.