Geologic units in Genesee county, New York

Camillus, Syracuse, and Vernon Formations (Upper Silurian) at surface, covers 35 % of this area

Shale, dolostone, salt, and gypsum.

Onondaga and Bois Blanc Limestones (Middle Devonian) at surface, covers 18 % of this area

In New York: Onondaga Limestone-Seneca, Morehouse (cherty), and Clarence Limestone Members, Edgecliff cherty Limestone Member, local coral bioherms; Bois Blanc Limestone-sandy, thin, discontinous. In Ontario: Dundee Limestone; Lucas Formation-dolostone, limestone (Anderdon); Amherstburg Formation-limestone, dolostone, sandstone (Sylvania); Bois Blanc Formation-dolostone, limestone, sandstone (Springvale).

Skaneateles Formation (Middle Devonian) at surface, covers 17 % of this area

Levanna Shale, Stafford Limestone Members.

Ludlowville Formation (Middle Devonian) at surface, covers 6 % of this area

Deep Run Shale, Tichenor Limestone, Wanakah and Ledyard Shales, Centerfield Limestone Members.

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

Windom and Kashong Shales, Menteth Limestone Members.

Genesee Group (Upper Devonian) at surface, covers 4 % of this area

West River Shale; Genundewa Limestone; Penn Yan and Geneseo Shales; North Evans Limestone.

Cashaqua and Middlesex Shales (Upper Devonian) at surface, covers 4 % of this area

Cashaqua and Middlesex Shales.

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

Oatka Creek Shale Member.

Angola and Rhinestreet Shales (Upper Devonian) at surface, covers 3 % of this area

Angola and Rhinestreet Shales.

Lockport Group (Upper Silurian) at surface, covers 3 % of this area

Consists of: Guelph, Oak Orchard, Eramosa, and Goat Island Dolostones; Gasport Limestone-local bioherms.

Akron Dolostone (Upper Silurian) at surface, covers 2 % of this area

Bertie Formation - dolostone, shale.

Lower Beers Hill Shale (Upper Devonian) at surface, covers < 0.1 % of this area

Dunn Hill, Millport, and Moreland Shales.