New York

From Wikimarcellus

The State of New York is home to roughly 70,000 natural gas wells. 14,000 of these are presently active. These wells are concentrated in Western New York and the Southern Tier. Much recent activity has focused on drilling into the Marcellus shale formation which is prevalent in the southwestern part of the state.

New York prospective areas outlined in blue
Courtesy of Cornell University Cooperative Extension[1]

The other major shale formation in New York is the Utica shale.

The prospective areas in the State for the Utica and Marcellus shale formations roughly is the region reaching from Chautauqua County eastward to Greene, Sullivan and Ulster counties.