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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 first survey was created in 1836, making it one of the oldest geological surveys in the United States. It was followed by the Second Survey, [2] which ran from 1874 to approximately 1895; and the Third Survey, which ran from 1910 to 1919. The fourth, and current, survey was created in 1919 and continues today.
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]
Plunketts Creek is an approximately 6.2-mile-long (10 km) tributary of Loyalsock Creek in Lycoming and Sullivan counties in the U.S. state of Pennsylvania.Two unincorporated villages and a hamlet are on the creek, and its watershed drains 23.6 square miles (61 km 2) in parts of five townships.
The Mississippian Pocono Formation is a mapped bedrock unit in Pennsylvania, Maryland, and West Virginia, in the United States.It is also known as the Pocono Group in Maryland and West Virginia, [2] and the upper part of the Pocono Formation is sometimes called the Burgoon Formation or Burgoon Sandstone in Pennsylvania.
The Ledger Formation or Ledger Dolomite is a geologic formation in Pennsylvania, United States. The Ledger is described as light-gray, locally mottled, massive, pure, coarsely crystalline dolomite . It may be siliceous in the middle part.
A map of the U.S. shows the Smackover Formation and the scientists’ sampling area in southwestern Arkansas. The formation is in yellow, and the sampling area is in red.
The Kinzers Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Cambrian Period. The base of the Kinzers Formation is primarily a dark-brown shale. The middle is a gray and white spotted limestone and, locally, marble having irregular partings. The top is a sandy limestone which weathers to a fine-grained ...