Maps

Maps of the thickness of the Marcellus shale, the depth to the Marcellus shale, and also the depth of organic rich Marcellus shale (limited to northern Pennsylvania) (link)

Marcellus Shale extent in New York State and recent active Marcellus Shale wells (link)

Marcellus Shale Occurrence in the Susquehanna River Basin (link)

Extent of Marcellus Shale Formation in the Delaware River Basin (link)

New York and the Chesapeake Bay (link)