Northeast

Marcellus

Marcellus Counties:

MD: Allegany, Garrett

PA: Allegheny, Armstrong, Beaver, Bedford, Blair, Bradford, Butler, Cambria, Cameron, Carbon,Centre, Clarion, Clearfield, Clinton, Columbia, Crawford, Elk, Erie, Fayette, Forest, Greene, Indiana, Jefferson, Lackawanna, Lawrence, Luzerne, Lycoming, McKean, Mercer, Monroe, Montour, Pike, Potter, Somerset, Sullivan, Susquehanna, Tioga, Venango, Warren, Washington, Wayne, Westmoreland, Wyoming

WV: Barbour, Braxton, Brooke, Calhoun, Clay, Doddridge, Gilmer, Hancock, Harrison, Lewis, Marion, Marshall, Monongalia, Ohio, Pleasants, Preston, Randolph, Ritchie, Roane, Taylor, Tucker, Tyler, Upshur, Webster, Wetzel
OH: Ashtabula, Belmont, Carroll, Columbiana, Guernsey, Harrison, Jefferson, Lake, Mahoning, Monroe, Trumbull, Washington

NY: Albany, Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung, Chenango, Cortland, Delaware, Erie, Genesee, Greene, Livingston, Madison, Onondaga, Ontario, Orange, Ostego, Schoharie, Schuyler, Seneca, Steuben, Sullivan, Tioga, Tompkins, Wyoming, Yates

Utica

Utica Counties:

OH: Ashland, Ashtabula, Belmont, Carroll, Columbiana, Coshocton, Crawford, Delaware, Fairfield, Franklin, Geauga, Guernsey, Harrison, Holmes, Huron, Jefferson, Knox, Lake, Licking, Lorain, Madison, Mahoning, Marion, Medina, Monroe, Morgan, Morrow, Muskingum, Noble, Perry, Pickaway, Portage, Richland, Stark, Summit, Trumbull, Tuscarawas, Union, Washington, Wayne

PA: Armstrong, Beaver, Butler, Cameron, Clarion, Crawford, Elk, Erie, Forest, Jefferson, Lawrence, McKean, Mercer, Potter, Venango, Warren, Tioga

Upper Devonian/Huron Shale

Upper Devonian/Huron Counties: KY: Boyd, Breathitt, Carter, Clay, Elliott, Estill, Floyd, Greenup, Harlan, Jackson, Johnson, Knott, Knox, Laurel, Lawrence, Lee, Letcher, Lewis, Leslie, Magoffin, Menifee, Martin, McCreary, Morgan, Owsley, Perry, Pike, Powell, Pulaski, Rockcastle, Rowan, Wayne, Whitley, Wolfe
WV: Boone, Cabell, Calhoun, Clay, Fayette, Jackson, Kanawha, Lincoln, Logan, Mason, McDowell, Mingo, Putnam, Raleigh, Ritchie, Roane, Wayne, Wirt, Wood, Wyoming
VA: Buchanan, Dickenson, Lee, Scott, Wise