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

Geologic units in Fulton county, New York

Quartzite, quartz-biotite schist and graphitic schist (Middle Proterozoic) at surface, covers 6 % of this area

Quartzite, quartz-biotite schist and graphitic schist - in part feldspathic, micaceous, garnetiferous, sillimanitic.

Lithology: quartzite; schist

Charnockite, granitic and quartz syenite gneiss (Middle Proterozoic) at surface, covers 7 % of this area

Charnockite, granitic and quartz syenite gneiss - variably leucocratic, containing varying amounts of hornblende, pyroxenes, biotite; may contain interlayered amphibolite, metasedimentary gneiss, migmatite. Overprint signifies inequigranular texture or phacoidal structure.

Lithology: granulite; felsic gneiss; granitic gneiss; amphibolite; migmatite

Quartz-feldspar gneiss (Middle Proterozoic) at surface, covers 12 % of this area

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

Lithology: felsic gneiss

Metagabbro (Middle Proterozoic) at surface, covers < 0.1 % of this area

Metagabbro - metagabbro, olivine metagabbro, derived amphibolite.

Lithology: mafic metavolcanic rock; amphibolite

Glacial and Alluvial Deposits (Quaternary) at surface, covers 21 % of this area

Glacial and Alluvial Deposits - underlying bedrock geology unknown.

Lithology: alluvium; glacial drift

Cambrian thru Middle Ordovician carbonate rock (Cambrian - Middle Ordovician) at surface, covers < 0.1 % of this area

Cambrian thru Middle Ordovician (Barneveld) carbonate rock - occuring as slivers caught along thrusts of later allochthones, or carbonate blocks in Taconic Melange.

Lithology: carbonate; melange

Biotite-quartz-plagioclase paragneiss (Middle Proterozoic) at surface, covers 4 % of this area

Biotite-quartz-plagioclase paragneiss - commonly very low in biotite content, with interbedded feldspathic and biotitic quartzite and amphibolite; sillimanite and garnet common, graphite sporadic.

Lithology: paragneiss; quartzite; amphibolite

Biotite and/or hornblende granite gneiss (Middle Proterozoic) at surface, covers 2 % of this area

Biotite and/or hornblende granite gneiss - locally pyroxenic; commonly with subordinate leucogranitic gneiss, biotite-quartz-plagioclase gneiss, other metasedimentary rocks, amphibolite, migmatite. Amphibolite with porphyroblasts of K-feldspar locally prominent in northwest Adirondacks. Overprint signifies inequigranular texture or phacoidal structure. In northwest Adirondacks, grades into Yphg.

Lithology: paragneiss; metasedimentary rock; amphibolite; migmatite

Beekmantown Group (in part) (Lower Ordovician) at surface, covers 3 % 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

Amphibolite (Middle Proterozoic) at surface, covers 0.3 % of this area

Amphibolite - commonly biotitic; garnetiferous, pyroxenic, in and adjacent to Adirondack Highlands.

Lithology: amphibolite

Black River Group (Middle Ordovician) at surface, covers < 0.1 % of this area

Black River Group - In Black River Valley: Chaumont Limestone-locally cherty; Lowville Limestone; Pamelia Formation-dolostone, shale, arkose. In Champlain Valley: Amsterdam, Isle La Motte, and Lowville Limestones: Pamelia Dolostone.

Lithology: limestone; dolostone (dolomite); shale; arkose; chert

Trenton and Black River Groups, undivided (Middle Ordovician) at surface, covers 3 % 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

Potsdam Sandstone (Cambrian) at surface, covers 0.6 % of this area

Potsdam Sandstone (Covey Hill in Quebec)

Lithology: sandstone

Undivided metasedimentary rock and related migmatite (Middle Proterozoic) at surface, covers 1.0 % of this area

Undivided metasedimentary rock and related migmatite.

Lithology: metasedimentary rock; migmatite

Biotite-quartz-plagioclase paragneiss, amphibolite, and related migmatite (Middle Proterozoic) at surface, covers 3 % of this area

Biotite-quartz-plagioclase paragneiss, amphibolite, and related migmatite - locally sillimanitic; commonly garnetiferous in and adjacent to Adirondack Highlands.

Lithology: paragneiss; amphibolite; migmatite

Theresa (Galway) Formation (Cambrian) at surface, covers 3 % of this area

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

Lithology: dolostone (dolomite); sandstone; shale

Biotite and/or hornblende granite gneiss (Middle Proterozoic) at surface, covers 8 % of this area

Biotite and/or hornblende granite gneiss - locally pyroxenic; commonly with subordinate leucogranitic gneiss, biotite-quartz-plagioclase gneiss, other metasedimentary rocks, amphibolite, migmatite. Amphibolite with porphyroblasts of K-feldspar locally prominent in northwest Adirondacks. Overprint signifies inequigranular texture or phacoidal structure. In northwest Adirondacks, grades into Yphg.

Lithology: granitic gneiss; metasedimentary rock; amphibolite; migmatite

Utica Shale (Middle Ordovician) at surface, covers 2 % of this area

Utica Shale

Lithology: black shale

Canajoharie Shale (Middle Ordovician) at surface, covers 12 % of this area

Canajoharie Shale - includes Hortonville and Ira Shales in Vermont.

Lithology: black shale

Beekmantown Group (in part) (Cambrian) at surface, covers 5 % 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

Pyroxene-hornblende-quartz-plagioclase gneiss (Middle Proterozoic) at surface, covers 2 % of this area

Pyroxene-hornblende-quartz-plagioclase gneiss.

Lithology: mafic gneiss

Interlayered metasedimentary rock and granitic, charnockitic, mangeritic, or syenitic gneiss (Middle Proterozoic) at surface, covers < 0.1 % of this area

Interlayered metasedimentary rock and granitic, charnockitic, mangeritic, or syenitic gneiss.

Lithology: metasedimentary rock; gneiss