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

Geologic units in Clinton county, New York

Stony Point Shale (Middle Ordovician) at surface, covers 0.4 % of this area

Stony Point Shale

Lithology: shale

Undivided metasedimentary rock and related migmatite (Middle Proterozoic) at surface, covers 2 % of this area

Undivided metasedimentary rock and related migmatite.

Lithology: metasedimentary rock; migmatite

Interlayered gabbroic or noritic metanorthosite (Middle Proterozoic) at surface, covers < 0.1 % of this area

Interlayered gabbroic or noritic metanorthosite - mangerite or charnockite, and the Yach lithology.

Lithology: metavolcanic rock; granulite; anorthosite

Charnockite, mangerite, pyroxene-quartz syenite gneiss (Middle Proterozoic) at surface, covers 0.6 % of this area

Charnockite, mangerite, pyroxene-quartz syenite gneiss - overprint signifies inequigranular texture.

Lithology: granulite; monzonite; gneiss

Theresa Formation (Cambrian - Lower Ordovician) at surface, covers 4 % of this area

Theresa Formation - dolostone, sandstone (Chateauguay in Quebec).

Lithology: dolostone (dolomite); sandstone

Ferrohedenbergite-fayalite granite and granite gneiss (Middle Proterozoic) at surface, covers < 0.1 % of this area

Ferrohedenbergite-fayalite granite and granite gneiss.

Lithology: granite; granitic gneiss

Cumberland Head Argillite (Middle Ordovician) at surface, covers 1 % of this area

Cumberland Head Argillite

Lithology: argillite

Potsdam Sandstone (Cambrian) at surface, covers 38 % of this area

Potsdam Sandstone (Covey Hill in Quebec)

Lithology: sandstone

Valcour, Crown Point, and Day Point Limestones (Middle Ordovician) at surface, covers 2 % of this area

Valcour, Crown Point, and Day Point Limestones - locally reefy, Ste. Therese Siltstone at base; Middlebury Limestone in Vermont; St. Martin and Rockcliffe Limestones in St. Lawrence Valley. Includes some Otbr and Obk adjacent to Champlain Thrust in Vermont.

Lithology: limestone; siltstone

Beekmantown Group (in part) (Lower Ordovician) at surface, covers 6 % 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

Trenton Group (Middle Ordovician) at surface, covers 0.7 % of this area

Trenton Group - In Black River Valley: Cobourg Formation-Hillier shale and limestone Member, Hallowell limestone Member; Denley, Sugar River, Kings Falls, and Rockland Limestones. In Champlain Valley: Glens Falls Formation-Montreal shale and limestone Member, Larrabee limestone Member.

Lithology: limestone; shale

Hybrid rock: mangeritic to charnockitic gneiss (Middle Proterozoic) at surface, covers < 0.1 % of this area

Hybrid rock: mangeritic to charnockitic gneiss - with xenocrysts of calcic andesine and, locally, xenoliths of anorthosite; with increasing percentage of anorthosite component, passes gradationally into anorthositic rocks.

Lithology: gneiss; anorthosite

Metanorthosite and anorthositic gneiss (Middle Proterozoic) at surface, covers 2 % of this area

Metanorthosite and anorthositic gneiss - mafic mineral percentage contoured in northwestern Marcy massif (St. Regis Quadrangle); contour value shown on high side of countoue line. See also Yach, Yack, Yamu.

Lithology: metavolcanic rock; paragneiss

Trenton and Black River Groups, undivided (Middle Ordovician) at surface, covers < 0.1 % 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

Black River Group (Middle Ordovician) at surface, covers 0.3 % 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

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

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

Lithology: amphibolite

Pyroxene and/or hornblende granitic gneiss (Middle Proterozoic) at surface, covers 21 % of this area

Pyroxene and/or hornblende granitic gneiss - biotitic in part; sodic plagioclase ranges from generally subordinate to locally dominant; plagioclase-rich facies locally contain disseminated magnetite and magnetite ore bodies; grades westward into Yhbg, and southward into Ylg.

Lithology: granitic gneiss

Charnockite, granitic and quartz syenite gneiss (Middle Proterozoic) at surface, covers 6 % 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

Metagabbro (Middle Proterozoic) at surface, covers 0.2 % of this area

Metagabbro - metagabbro, olivine metagabbro, derived amphibolite.

Lithology: mafic metavolcanic rock; amphibolite

Glacial and Alluvial Deposits (Quaternary) at surface, covers 10 % of this area

Glacial and Alluvial Deposits - underlying bedrock geology unknown.

Lithology: alluvium; glacial drift