Geologic units in Livingston county, New York

West Hill and Gardeau Formations (Upper Devonian) at surface, covers 20 % of this area

Shale, siltstone; Roricks Glen Shale; upper Beers Hill Shale; Grimes Siltstone.

Lower Beers Hill Shale (Upper Devonian) at surface, covers 9 % of this area

Dunn Hill, Millport, and Moreland Shales.

Cashaqua and Middlesex Shales (Upper Devonian) at surface, covers 9 % of this area

Cashaqua and Middlesex Shales.

Machias Formation (Upper Devonian) at surface, covers 8 % of this area

Shale, siltstone; Rushford Sandstone; Caneadea, Canisteo, and Hume Shales; Canaseraga Sandstone; South Wales and Dunkirk Shales.

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

Windom and Kashong Shales, Menteth Limestone Members.

Skaneateles Formation (Middle Devonian) at surface, covers 7 % 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.

Genesee Group (Upper Devonian) at surface, covers 5 % of this area

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

Onondaga and Bois Blanc Limestones (Middle Devonian) at surface, covers 5 % 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).

Nunda Formation (Upper Devonian) at surface, covers 4 % of this area

Sandstone, shale.

Wiscoy Formation (Upper Devonian) at surface, covers 4 % of this area

Sandstone, shale; Hanover and Pipe Creek Shales.

Nunda Formation (Upper Devonian) at surface, covers 4 % of this area

Sandstone, shale.

Genesee Group (Upper Devonian) at surface, covers 3 % 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.

Wiscoy Formation (Upper Devonian) at surface, covers 3 % of this area

Sandstone, shale; Hanover and Pipe Creek Shales.

Akron Dolostone (Upper Silurian) at surface, covers 3 % of this area

Bertie Formation - dolostone, shale.

Marcellus Formation (Middle Devonian) at surface, covers 2 % of this area

Oatka Creek Shale Member.

Onondaga Limestone (Middle Devonian) at surface, covers 0.3 % of this area

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

Sonyea Group (Upper Devonian) at surface, covers 0.3 % of this area

In west: Cashaqua and Middlesex Shales. In east: Rye Point Shale; Rock Stream ("Enfield") Siltstone; Pulteney, Sawmill Creek, Johns Creek, and Montour Shales.

West Hill and Gardeau Formations (Upper Devonian) at surface, covers < 0.1 % of this area

Shale, siltstone; Roricks Glen Shale; upper Beers Hill Shale; Grimes Siltstone.

Machias Formation (Upper Devonian) at surface, covers < 0.1 % of this area

Shale, siltstone; Rushford Sandstone; Caneadea, Canisteo, and Hume Shales; Canaseraga Sandstone; South Wales and Dunkirk Shales; In Pennsylvania: Towanda Formation-shale, sandstone.

Beers Hill, Dunn Hill, Millport, and Moreland Shales; Grimes Siltstone (Upper Devonian) at surface, covers < 0.1 % of this area

Beers Hill, Dunn Hill, Millport, and Moreland Shales; Grimes Siltstone.