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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 ]
There are two main formations encompassed by the group: the Mahantango Formation and the Marcellus Shale. In southwestern Virginia, where the two sub-units are not easily distinguishable, the Hamilton Group is broadly equivalent to the Millboro Shale or Millboro Formation. [3] The group is named for the village of Hamilton, New York.
Huntley Mountain Formation: Devonian: Catskill Formation: Dck Devonian 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 ...
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]
Marcellus; Marcellus Formation, a mapped bedrock unit in eastern North America; Protographium marcellus, a butterfly; Pseudorhabdosynochus marcellus, a fish parasite; USS Marcellus, a collier in service with the United States Navy from 1898 to 1910
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.
Marcellus Group/Esopus Formation: Devonian: Meads Creek Formation equivalent: Devonian: Medina Group/Grimsby Formation: Silurian: Medina Group/Power Glen Formation ...