Geologic units in Cayuga county, New York

Genesee Group (Upper Devonian) at surface, covers 28 % of this area

West River Shale; Genundewa Limestone; Penn Yan and Geneseo Shales; all except Geneseo replaced eastwardly by Ithaca Formation-shale, siltstone and Sherburne Siltstone.

Vernon Formation (Upper Silurian) at surface, covers 14 % of this area

Dhale, dolostone.

Camillus and Syracuse Formations (Upper Silurian) at surface, covers 9 % of this area

Shale, dolostone, gypsum, salt.

Clinton Group (Lower Silurian) at surface, covers 8 % of this area

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

Skaneateles Formation (Middle Devonian) at surface, covers 7 % of this area

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

Ludlowville Formation (Middle Devonian) at surface, covers 7 % of this area

In west: Deep Run Shale, Tichenor Limestone, Wanakah and Ledyard Shales, Centerfield Limestone Members. In east: King Ferry Shale and other members, Stone Mill Sandstone Member.

Moscow Formation (Middle Devonian) at surface, covers 5 % of this area

In west: Windom and Kashong Shales, Menteth Limestone Members; In east: Cooperstown Shale Member, Portland Point Limestone Member.

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

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

Akron Dolostone (Upper Silurian) at surface, covers 4 % of this area

Bertie Formation - dolostone, shale.

Marcellus Formation (Middle Devonian) at surface, covers 3 % of this area

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

Undifferentiated Medina Group and Queenston Formation (Upper Ordovician - Lower Silurian) at surface, covers 3 % of this area

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

Tully Limestone (Middle Devonian) at surface, covers 3 % of this area

Tully Limestone

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

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

Helderberg Group (Lower Devonian) at surface, covers 1 % of this area

Coeymans and Manlius Limestones; Rondout Dolostone.

Oriskany Sandstone (Lower Devonian) at surface, covers 0.2 % of this area

Oriskany Sandstone.

Cobleskill Limestone (Upper Silurian) at surface, covers < 0.1 % of this area

Bertie and Camillus Formations - dolostone, shale.