Geologic units in Schoharie county, New York

Panther Mountain Formation (Middle Devonian) at surface, covers 22 % of this area

Shale, siltstone, sandstone.

Moscow Formation (Middle Devonian) at surface, covers 15 % of this area

In west: Cooperstown and Portland Point shale and sandstone Members; In east: ""Manorkill"" and Portland Point shale and sandstone Members.

Marcellus Formation (Middle Devonian) at surface, covers 14 % of this area

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

Oneonta Formation (Middle - Upper Devonian) at surface, covers 13 % of this area

Shale, sandstone, conglomerate.

Unadilla, Laurens, New Lisbon, and Gilboa Formations (Middle Devonian) at surface, covers 9 % of this area

Shale, siltstone, sandstone.

Helderberg Group (Lower Devonian) at surface, covers 8 % 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.

Schenectady Formation (Upper Ordovician) at surface, covers 7 % of this area

Graywacke, sandstone, siltstone, shale.

Onondaga Limestone (Lower to Middle Devonian) at surface, covers 4 % of this area

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

Undifferentiated Lower Hamilton Group (Middle Devonian) at surface, covers 2 % of this area

Panther Mountain, Mount Marion, Stony Hollow, and Union Springs shales and sandstones.

Utica Shale (Middle Ordovician) at surface, covers 1 % of this area

Utica Shale

Oriskany Formation (Lower Devonian) at surface, covers 1 % of this area

Sandstone, arenaceous limestone.

Cobleskill Limestone (Upper Silurian) at surface, covers 1 % of this area

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

Frankfort Formation (Upper Ordovician) at surface, covers 1 % of this area

Shale, siltstone.

Plattekill and Ashokan Formations (Middle Devonian) at surface, covers 0.6 % of this area

Shale, sandstone; Ashokan Formation-shale, sandstone.

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

Shale, sandstone, conglomerate.

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

Limestone, chert.