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Mineral Resources > Online Spatial Data > Geology > by state > New York Geology

Geologic units in Montgomery county, New York

Potsdam Sandstone (Cambrian) at surface, covers 0.3 % of this area

Potsdam Sandstone (Covey Hill in Quebec)

Lithology: sandstone

Undivided metasedimentary rock and related migmatite (Middle Proterozoic) at surface, covers 0.5 % of this area

Undivided metasedimentary rock and related migmatite.

Lithology: metasedimentary rock; migmatite

Theresa (Galway) Formation (Cambrian) at surface, covers 0.7 % of this area

Theresa (Galway) Formation - dolostone, sandstone, shale.

Lithology: dolostone (dolomite); sandstone; shale

Utica Shale (Middle Ordovician) at surface, covers 30 % of this area

Utica Shale

Lithology: black shale

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

Canajoharie Shale - includes Hortonville and Ira Shales in Vermont.

Lithology: black shale

Beekmantown Group (in part) (Cambrian) at surface, covers 6 % of this area

Beekmantown Group (in part) - In Champlain Valley: Whitehall Formation-dolostone, limestone (with Cryptozoon reefs); Ticonderoga Formation-dolostone (locally cherty), sandstone. In Vermont: Clarendon Springs Dolostone; Danby Formation-sandstone, quartzite, dolostone.

Lithology: dolostone (dolomite); limestone; sandstone; quartzite

Clinton Group (Silurian) at surface, covers < 0.1 % of this area

Clinton Group - Herkimer Sandstone including Joslin Hill and Jordanville Members; Kirkland Hematite; Willowvale Shale; Westmoreland Hematite; Sauquoit Formation-sandstone, shale; Otsquago Sandstone; Oneida Conglomerate.

Lithology: shale; sandstone; chemical; conglomerate

Quartz-feldspar gneiss (Middle Proterozoic) at surface, covers 0.2 % of this area

Quartz-feldspar gneiss - with variable amounts of garnet, sillimanite, biotite.

Lithology: felsic gneiss

Glacial and Alluvial Deposits (Quaternary) at surface, covers 2 % of this area

Glacial and Alluvial Deposits - underlying bedrock geology unknown.

Lithology: alluvium; glacial drift

Helderberg Group (Lower Devonian) at surface, covers < 0.1 % of this area

Helderberg Group - 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.

Lithology: limestone; dolostone (dolomite)

Beekmantown Group (in part) (Lower Ordovician) at surface, covers 10 % of this area

Beekmantown Group (in part) - In St. Lawrence Valley: Ogdensburg Dolostone (Beauharnois Dolostone in Canada); In Champlain Valley: Providence Island Dolostone; Fort Cassin Formation-limestone, dolostone; Fort Ann Formation (Spellman of Clinton and Essex Counties)-limestone, dolostone; Cutting Formation-dolostone (locally cherty), limestone, siltstone. In Vermont: includes Bridport, Bascom, Cutting, and Shelburne carbonates.

Lithology: dolostone (dolomite); limestone; chert; siltstone

Frankfort Formation (Upper Ordovician) at surface, covers 4 % of this area

Frankfort Formation - shale, siltstone.

Lithology: shale; siltstone

Cobleskill Limestone (Upper Silurian) at surface, covers < 0.1 % of this area

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

Lithology: limestone; shale; dolostone (dolomite)

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

Schenectady Formation - graywacke, sandstone, siltstone, shale.

Lithology: graywacke; sandstone; siltstone; shale

Trenton and Black River Groups, undivided (Middle Ordovician) at surface, covers 5 % of this area

Trenton and Black River Groups, undivided - Glens Falls and Orwell Limestones. In Canada: Lindsay, Verulam, Bodcaygeon, Gull River Limestones; Shadow Lake Dolostone.

Lithology: limestone