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The Marcellus Formation or the Marcellus Shale is a Middle Devonian age unit of sedimentary rock found in eastern North America. Named for a distinctive outcrop near the village of Marcellus , New York , in the United States , [ 3 ] it extends throughout much of the Appalachian Basin .
The Marcellus natural gas trend is a large geographic area of prolific shale gas extraction from the Marcellus Shale or Marcellus Formation, of Devonian age, in the eastern United States. [2] The shale play encompasses 104,000 square miles and stretches across Pennsylvania and West Virginia, and into eastern Ohio and western New York. [ 3 ]
The Hamilton Group is a Devonian-age geological group which is located in the Appalachian region of the United States.It is present in New York, Pennsylvania, Maryland, Ohio, West Virginia, northwestern Virginia and Ontario, Canada, [1] [2] and is mainly composed of marine shale with some sandstone.
Brallier Formation: Db Devonian Harrell Formation: Dh Devonian Hamilton Group: Mahantango Formation: Dmh Devonian Hamilton Group Marcellus Formation: Dm Devonian Onondaga Formation: Do Devonian Old Port Formation: Dop Devonian Old Port Formation Ridgeley Member: Dr Devonian/Silurian Keyser Formation: DSk Silurian: Tonoloway Formation: Sto ...
The upper portion of the Helderberg, or the Kalkberg Formation is host to the Bald Hill ash bed, dated to 417.6 million years ago. [2] The Helderberg is composed chiefly of limestone and dolomite. [3] In Maryland and southern Pennsylvania, the Helderberg is divided into three formations.
The Marcellus Formation is a vast geological layer of shale spanning Pennsylvania, West Virginia and parts of other states and Ontario, which is named for an outcropping in or near Marcellus. [3] The Town of Marcellus contains a village also named Marcellus. The town and village are southwest of Syracuse. Marcellus Countryside (Rose Hill).
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The Devonian Mahantango Formation is a mapped bedrock unit in Pennsylvania, West Virginia, and Maryland. [1] [2] [3] It is named for the North branch of the Mahantango Creek in Perry and Juniata counties in Pennsylvania. It is a member of the Hamilton Group, along with the underlying the Marcellus Formation Shale. [4]