page_title: Marcellus Formation
hierarchical_section_title: Marcellus Formation
caption_attribution_description: English: Marcellus Shale bank along Rt 174 just south of Slate Hill Road in Marcellus, NY
context_page_description: 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,
  it extends throughout much of the Appalachian Basin.
  The unit name usage by the U.S. Geological Survey includes Marcellus Shale and Marcellus Formation. The term "Marcellus Shale" is the preferred name throughout most of the Appalachian region, although the term "Marcellus Formation" is also acceptable within the State of Pennsylvania. The unit was first described and named as the "Marcellus shales" by J. Hall in 1839.
context_section_description: 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,
  it extends throughout much of the Appalachian Basin.
  The unit name usage by the U.S. Geological Survey (USGS) includes Marcellus Shale and Marcellus Formation.  The term "Marcellus Shale" is the preferred name throughout most of the Appalachian region, although the term "Marcellus Formation" is also acceptable within the State of Pennsylvania. The unit was first described and named as the "Marcellus shales" by J. Hall in 1839.
caption: Marcellus shale exposure above Marcellus, N.Y. The vertical joints create sheer cliff faces.
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