Geologic units in Wyoming county, New York

Machias Formation (Upper Devonian) at surface, covers 47 % of this area

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

Angola and Rhinestreet Shales (Upper Devonian) at surface, covers 17 % of this area

Angola and Rhinestreet Shales.

Wiscoy Formation (Upper Devonian) at surface, covers 12 % of this area

Sandstone, shale; Hanover and Pipe Creek Shales.

Nunda Formation (Upper Devonian) at surface, covers 10 % of this area

Sandstone, shale.

West Hill and Gardeau Formations (Upper Devonian) at surface, covers 6 % of this area

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

Cashaqua and Middlesex Shales (Upper Devonian) at surface, covers 3 % of this area

Cashaqua and Middlesex Shales.

Lower Beers Hill Shale (Upper Devonian) at surface, covers 3 % of this area

Dunn Hill, Millport, and Moreland Shales.

Genesee Group (Upper Devonian) at surface, covers 0.8 % of this area

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

Moscow Formation (Middle Devonian) at surface, covers 0.5 % of this area

Windom and Kashong Shales, Menteth Limestone Members.

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

Sandstone, shale.