Geologic units in Oneida county, New York

Utica Shale (Middle Ordovician) at surface, covers 20 % of this area

Utica Shale

Oswego Sandstone (Upper Ordovician) at surface, covers 11 % of this area

Oswego Sandstone

Pulaski and Whetstone Gulf Formations (Upper Ordovician) at surface, covers 10 % of this area

Siltstone, shale.

Clinton Group (Lower Silurian) at surface, covers 9 % of this area

Herkimer Sandstone; Kirkland Hematite; Willowvale Shale; Westmoreland Hematite; Sauquoit Formation-sandstone, shale; Oneida Conglomerate.

Trenton Group (Middle Ordovician) at surface, covers 6 % of this area

In Black River Valley: Cobourg Formation-Hillier shale and limestone Member, Hallowell limestone Member; Denley, Sugar River, Kings Falls, and Rockland Limestones. In Champlain Valley: Glens Falls Formation-Montreal shale and limestone Member, Larrabee limestone Member.

Frankfort Formation (Upper Ordovician) at surface, covers 5 % of this area

Shale, siltstone.

Undifferentiated Medina Group and Queenston Formation (Upper Ordovician - Lower Silurian) at surface, covers 5 % of this area

Grimsby Formation-sandstones, shale; and Queenston Formation-shale, siltstone.

Interlayered metasedimentary rock and granitic, charnockitic, mangeritic, or syenitic gneiss (Middle Proterozoic) at surface, covers 5 % of this area

Interlayered metasedimentary rock and granitic, charnockitic, mangeritic, or syenitic gneiss.

Pulaski and Whetstone Gulf Formations (Upper Ordovician) at surface, covers 4 % of this area

Shale, siltstone.

Marcellus Formation (Middle Devonian) at surface, covers 4 % of this area

Pecksport, Solsville, Otsego, and Chittenango shale and sandstone Members, Cherry Valley Limestone, and Union Springs Shale Members.

Clinton Group (Silurian) at surface, covers 4 % of this area

Herkimer Sandstone including Joslin Hill and Jordanville Members; Kirkland Hematite; Willowvale Shale; Westmoreland Hematite; Sauquoit Formation-sandstone, shale; Otsquago Sandstone; Oneida Conglomerate.

Glacial and Alluvial Deposits (Quaternary) at surface, covers 3 % of this area

Underlying bedrock geology unknown.

Helderberg Group (Lower Devonian) at surface, covers 2 % of this area

West of Albany: Alsen, Becraft, New Scotland, Kalkberg, Coeymans, and Manlius Limestones; Rondout Dolostone. South of Albany: Port Ewen, Alsen thru Manlius Limestones; Rondout Dolostone.

Cobleskill Limestone (Upper Silurian) at surface, covers 2 % of this area

Bertie, Camillus, and Syracuse Formations - shale, dolostone; Brayman Shale.

Vernon Shale (Upper Silurian) at surface, covers 2 % of this area

Vernon Shale

Onondaga Limestone (Middle Devonian) at surface, covers 2 % of this area

Seneca, Morehouse (cherty), and Nedrow Limestone Members, Edgecliff cherty Limestone Member, local bioherms.

Vernon Formation (Upper Silurian) at surface, covers 0.9 % of this area

Dhale, dolostone.

Lockport Group (Upper Silurian) at surface, covers 0.7 % of this area

Oak Orchard and Penfield Dolostones; both replaced eastwardly by Sconondoa Formation-limestone, dolostone.

Ilion Shale (Upper Silurian) at surface, covers 0.7 % of this area

Ilion Shale

Marcellus Formation (Middle Devonian) at surface, covers 0.6 % of this area

In west: Oatka Creek Shale Member; In east: Cardiff and Chittenango Shale Members, Cherry Vale Limestone and Union Springs Shale Members.

Black River Group (Middle Ordovician) at surface, covers 0.6 % of this area

In Black River Valley: Chaumont Limestone-locally cherty; Lowville Limestone; Pamelia Formation-dolostone, shale, arkose. In Champlain Valley: Amsterdam, Isle La Motte, and Lowville Limestones: Pamelia Dolostone.

Panther Mountain Formation (Middle Devonian) at surface, covers 0.4 % of this area

Shale, siltstone, sandstone.

Syracuse Formation (Upper Silurian) at surface, covers 0.3 % of this area

Dolostone, shale, gypsum, salt.

Cobleskill Limestone (Upper Silurian) at surface, covers 0.2 % of this area

Bertie and Camillus Formations - dolostone, shale.

Oswego Sandstone (Upper Ordovician) at surface, covers 0.2 % of this area

Oswego Sandstone

Undivided metasedimentary rock and related migmatite (Middle Proterozoic) at surface, covers 0.1 % of this area

Undivided metasedimentary rock and related migmatite.

Helderberg Group (Lower Devonian) at surface, covers 0.1 % of this area

Coeymans and Manlius Limestones; Rondout Dolostone.

Onondaga Limestone (Middle Devonian) at surface, covers 0.1 % of this area

Seneca, Morehouse (cherty), and Nedrow Limestone Members, Edgecliff cherty Limestone Member, local bioherms.

Oriskany Formation (Lower Devonian) at surface, covers < 0.1 % of this area

Sandstone, arenaceous limestone.

Skaneateles Formation (Middle Devonian) at surface, covers < 0.1 % of this area

In west: Levanna Shale and Stafford Limestone Members; In east: Butternut, Pompey, and Delphi Station Shale Members, Mottville Sandstone Member.

Onondaga Limestone (Lower to Middle Devonian) at surface, covers < 0.1 % of this area

Schoharie Formation-shale, limestone; Carlisle Center Siltstone; Esopus Shale.

Utica Shale (Middle Ordovician) at surface, covers < 0.1 % of this area

Utica Shale

Black River Group (Middle Ordovician) at surface, covers < 0.1 % of this area

Chaumont Limestone-chert; Lowville Limestone; Pamelia Dolostone.