Geologic units in Albany county, New York

Undifferentiated Lower Hamilton Group (Middle Devonian) at surface, covers 27 % of this area

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

Normanskill Shale (Middle Ordovician) at surface, covers 23 % of this area

Minor mudstone, sandstone.

Schenectady Formation (Upper Ordovician) at surface, covers 17 % of this area

Graywacke, sandstone, siltstone, shale.

Plattekill and Ashokan Formations (Middle Devonian) at surface, covers 13 % of this area

Shale, sandstone; Ashokan Formation-shale, sandstone.

Onondaga Limestone (Lower to Middle Devonian) at surface, covers 6 % of this area

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

Austin Glen Formation (Middle Ordovician) at surface, covers 6 % of this area

Graywacke, shale

Helderberg Group (Lower Devonian) at surface, covers 5 % 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.

Moscow Formation (Middle Devonian) at surface, covers 1 % of this area

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

Glenerie Formation (Lower Devonian) at surface, covers 0.9 % of this area

Limestone, chert.

Canajoharie Shale (Middle Ordovician) at surface, covers 0.2 % of this area

Canajoharie Shale

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.

Panther Mountain Formation (Middle Devonian) at surface, covers < 0.1 % of this area

Shale, siltstone, sandstone.

Oneonta Formation (Middle - Upper Devonian) at surface, covers < 0.1 % of this area

Shale, sandstone, conglomerate.