Geologic units in Greene county, New York

Oneonta Formation (Middle - Upper Devonian) at surface, covers 33 % of this area

Shale, sandstone, conglomerate.

Plattekill and Ashokan Formations (Middle Devonian) at surface, covers 24 % of this area

Shale, sandstone; Ashokan Formation-shale, sandstone.

Lower Walton Formation (Upper Devonian) at surface, covers 15 % of this area

Shale, sandstone, conglomerate.

Austin Glen Formation (Middle Ordovician) at surface, covers 8 % of this area

Graywacke, shale

Upper Walton Formation (Upper Devonian) at surface, covers 6 % of this area

Shale, sandstone, conglomerate.

Undifferentiated Lower Hamilton Group (Middle Devonian) at surface, covers 6 % of this area

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

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

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

Onondaga Limestone (Lower to Middle Devonian) at surface, covers 1 % of this area

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

Helderberg Group (Lower Devonian) at surface, covers 1 % 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.

Mount Merino and Indian River Formations (Ordovician) at surface, covers 0.9 % of this area

Shale, slate, cherts.

Glenerie Formation (Lower Devonian) at surface, covers 0.7 % of this area

Limestone, chert.

Port Ewen thru Manlius Limestone, Rondout Dolostone, undifferentiated. (Upper Silurian - Lower Devonian) at surface, covers 0.5 % of this area

Port Ewen thru Manlius Limestone, Rondout Dolostone, undifferentiated.

Stuyvesant Falls Formation (Ordovician) at surface, covers 0.3 % of this area

South of Troy; shale, siltstone.

Unadilla, Laurens, New Lisbon, and Gilboa Formations (Middle Devonian) at surface, covers 0.2 % of this area

Shale, siltstone, sandstone.

Normanskill Shale (Middle Ordovician) at surface, covers < 0.1 % of this area

Minor mudstone, sandstone.

Taconic Melange (Middle Ordovician) at surface, covers < 0.1 % of this area

Chaotic mixture of Early Cambrian thru Middle Ordovician pebble to block-size angular to rounded clasts in a pelitic matrix of Middle Ordovician (Barneveld) age. Rims and floors earlier submarine gravity slides of Taconian Orogeny.

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

Sandstone, arenaceous limestone.

Germantown Formation (Cambrian) at surface, covers < 0.1 % of this area

South of Troy; shale, conglomerate, limestone.

Nassau Formation (Cambrian?) at surface, covers < 0.1 % of this area

South of 43 degrees; slate, shale, thin quartzite, includes Stuyvesant Conglomerate, Diamond Rock Quartzite, Curtis Mountain Quartzite, and Bomoseen Graywacke Members.

Schenectady Formation (Upper Ordovician) at surface, covers < 0.1 % of this area

Graywacke, sandstone, siltstone, shale.