South North West East West East West East West East Eastern Kentucky Central West Virginia Eastern and Central Ohio Western and Central Pennsylvania Western and Central New York Age Stratigraphy from: Repetski and others (2008) Stratigraphy from: Ryder and others (2008, 2009) Stratigraphy from: Ryder and others (2008, 2009, 2010) Stratigraphy from: Berg and others (1983); Ryder and others (2010) Stratigraphy from: Repetski and others (2008) Era System Series (Ma) Valley Valley Rome Trough Rome Trough Rome Trough and Ridge Bedford Shale and Ridge
Cleveland Member Venango Group Catskill Formation 359.2 Upper Devonian strata, undivided Ohio Shale Ohio Three Lick Bed Chagrin Shale equivalent rocks Chagrin Shale Bradford Group Foreknobs Formation Perrysburg Formation Shale Dunkirk Shale Member Huron Member of Ohio Shale Huron Member Elk Group Scherr Formation Upper Dunkirk Shale Java Formation Angola Shale Member Olentangy Shale (upper) Java Formation Java Formation Angola Shale Member West Falls West Falls Brallier Formation West Falls Angola Shale Member Formation Rhinestreet Shale Member Rhinestreet Shale Member of the Formation Rhinestreet Shale Member Formation Rhinestreet Shale Member Upper Devonian strata, undivided West Falls Formation 385.3 Sonyea and Genesee Formations, undivided Sonyea and Genesee Formations, undivided Sonyea and Genesee Formations, undivided Tully Limestone Tully Limestone Tully Limestone Mahantango Formation Mahantango Formation Moscow, Ludlowville, and Skaneateles Shales, undivided Hamilton Olentangy Shale (lower) Hamilton Hamilton Middle Group Group Group Tioga Bentonite Marcellus Shale Marcellus Shale Tioga Bentonite Marcellus Shale Marcellus Shale Onondaga Limestone Boyle Dolomite Delaware Limestone Onondaga Limestone Huntersville Chert Huntersville Chert and Onondaga Limestone Needmore Onondaga Limestone Devonian Columbus Limestone Shale 397.5 Oriskany Sandstone Oriskany Sandstone Ridgeley Sandstone
Bois Blanc Formation Oriskany Oriskany Sandstone Lower Sandstone Shriver Formation and Helderberg Limestone Helderberg Licking Creek Limestone, Limestone undivided Mandata Shale Mandata Shale Helderberg Limestone 416.0 Keyser Limestone (upper) Corriganville and New Creek Limestones, undivided Bass Islands Dolomite Keyser Formation Helderberg Group Bass Islands Dolomite Keyser Limestone (lower) Big Mountain Shale Bass Islands Dolomite Akron Dolomite Pridoli Camillus Shale Camillus Formation Salina Group Tonoloway Formation Salina Salina Group Tonoloway Limestone Salina Group Salina Group Syracuse Formation Syracuse Formation Group 418.7 Vernon Formation Wills Creek Formation Vernon Formation ? “Newburg zone” of drillers ?
“Corniferous ” carbonate formations Tymochtee and Upper Newburg sandstone Wills Creek Formation Paleozoic Ludlow Greenfield Limestones, McKenzie Eramosa Dolomite Lockport Dolomite McKenzie Limestone undivided Lockport Dolomite Lockport Dolomite 422.9 Member Lockport Group
Formation Rochester Member of Berg Mifflintown and others (1983) Keefer Sandstone of Ohio and West Virginia (Ryder, 2004) Wenlock Keefer Formation of Pennsylvania (Ryder, 2004) Keefer Sandstone Keefer Sandstone of Ohio 428.2 (Big Six sandstone) and West Virginia (Ryder, 2004) Keefer Formation of Silurian Rochester Shale Rochester Shale Pennsylvania (Ryder, 2004) Alger Shale Rose Hill Formation Clinton Group Lower Silurian carbonates Rose Hill Formation
Rose Hill Lower Silurian carbonates and shales, undivided Formation and shales, undivided Lower
Llandovery Group Drowning Castanea Member Clinch Crab Orchard Undivided members Cabot Head Shale “Clinton” sandstone, Cabot Head Shale, and Medina Sandstone Creek Tuscarora Sandstone Cabot Head Shale Medina Group Formation Medina sandstone, undivided Group Tuscarora Formation 443.7 Brassfield Member Brassfield Limestone Juniata Formation Queenston Shale Drakes Formation through Clays Ferry Formation, undivided Juniata Formation Queenston Shale Queenston Shale Reedsville Shale Cincinnati group (informal usage) Reedsville Shale Bald Eagle Formation Oswego Sandstone Lorraine Group Utica Shale Lexington Limestone Utica Shale Utica Shale Antes Shale Utica Shale Upper Trenton Limestone Trenton Group Millbrig Bentonite Bed Millbrig Bentonite Bed Trenton Limestone Millbrig Bentonite Bed Millbrig Bentonite Bed Trenton Limestone
Deicke Bentonite Bed Deicke Bentonite Bed Deicke Bentonite Bed Deicke Bentonite Bed Black River Group Black River Group Ordovician High Bridge Group Black River Limestone Black River Group
460.9 Loysburg Formation Wells Creek dolomite (informal usage) Unnamed anhydritic dolomite Wells Creek formation (informal usage)
Middle St. Peter Sandstone Unnamed sandstone (St. Peter Sandstone Beekmantown Group 471.8 equivalent)
EXPLANATION Major lithology Sample locations Sandstone Limestone with chert From Salina Group, Bass Islands Dolomite, Keyser Limestone Figure 2. Correlation chart of Middle Ordovician through Upper Devonian rocks in Kentucky, New York, Ohio, Pennsylvania, and West Virginia showing intervals sampled for total organic carbon (TOC) and (or Formation), Wills Creek Formation, or Tonoloway Limestone Gray shale Dolomite Rock-Eval analysis. Geologic time scale from Gradstein and others (2004). Black shale Dolomite with dark-gray to black shale From Lockport Dolomite (or Group), Eramosa Dolomite, or McKenzie Limestone (or Member) U.S. Geological Survey Professional Paper 1708–G.11 Red shale Dolomite with evaporite beds From Cabot Head Shale, Rose Hill Formation, Rochester Shale, Limestone Bentonite bed—Dashed where or other Lower Silurian strata approximate