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

Geologic units in Sullivan county, New York

Towamensing Member of Catskill Formation (Devonian) at surface, covers < 0.1 % of this area

Towamensing Member of Catskill Formation - Dominantly gray sandstone and some siltstone and shale; freshwater fossils.

Lithology: sandstone; siltstone; shale

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)

Honesdale Formation (Upper Devonian) at surface, covers 24 % of this area

Honesdale Formation - sandstone, shale.

Lithology: sandstone; shale

Onondaga Limestone (Lower to Middle Devonian) at surface, covers 0.2 % of this area

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

Lithology: shale; limestone; siltstone

Moscow Formation (Middle Devonian) at surface, covers 6 % of this area

Moscow Formation - in west: Cooperstown and Portland Point shale and sandstone Members; In east: "Manorkill" and Portland Point shale and sandstone Members.

Lithology: shale; sandstone

Long Run and Walcksville Members of Catskill Formation, undivided (Devonian) at surface, covers < 0.1 % of this area

Long Run and Walcksville Members of Catskill Formation, undivided - Includes, in descending order, the Long Run (Dclr) and Walcksville (Dcw) Members of the Catskill Formation, which are described separately below.

Lithology: sandstone; siltstone; mudstone

Austin Glen Formation (Pawlet in Vermont) (Middle Ordovician) at surface, covers 2 % of this area

Austin Glen Formation (Pawlet in Vermont) - graywacke, shale.

Lithology: graywacke; shale

Bloomsburg Formation (Upper Silurian) at surface, covers 0.9 % of this area

Bloomsburg Formation - shale, sandstone; Guymard Quartzite; Otisville Shale; Shawangunk Conglomerate-sandstone, conglomerate.

Lithology: shale; sandstone; quartzite; conglomerate

Undifferentiated Lower Devonian and Silurian rocks (Lower Devonian - Silurian) at surface, covers 0.2 % of this area

Undifferentiated Lower Devonian and Silurian rocks - in northern Ulster County: Port Ewen thru Manlius Limestones; Rondout Dolostone; Binnewater Sandstone; High Falls Shale. In Orange County: Kanhouse Sandstone; Woodbury Creek Formation-shale, sandstone; Esopus Shale; Connelly Conglomerate; Central Valley Sandstone; New Scotland Limestone thru Rondout Dolostone; Decker Limestone; Poxono Island Formation-shale, dolostone; Longwood Shale; Green Pond Conglomerate.

Lithology: limestone; dolostone (dolomite); sandstone; shale; conglomerate

Slide Mountain Formation (Upper Devonian) at surface, covers 12 % of this area

Slide Mountain Formation - sandstone, shale, conglomerate.

Lithology: sandstone; shale; conglomerate

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

Catskill Formation - Grayish-red sandstone, siltstone, shale, and mudstone; locally conglomeratic; contains gray sandstone in upper part; lithologies arranged in fining-upward cycles; equivalent to the Hampshire Formation south of Pennsylvania.

Lithology: sandstone; siltstone; shale; mudstone; conglomerate

Undifferentiated Hamilton Group (Middle Devonian) at surface, covers 1 % of this area

Undifferentiated Hamilton Group - shale, siltstone. In eastern Orange County: Skunnemunk Formation-sandstone, conglomerate; Bellvale Formation-shale, sandstone; Cornwall Shale.

Lithology: shale; siltstone; sandstone; conglomerate

Rondout Formation (Upper Silurian) at surface, covers 0.3 % of this area

Rondout Formation - dolostone, limestone; Binnewater Sandstone; High Falls Shale; Warwarsing Limestone; Decker Limestone; Bossardville Limestone; Poxono Island Formation-shale, dolostone.

Lithology: siltstone; limestone; sandstone; dolostone (dolomite); shale

Lower Walton Formation (Upper Devonian) at surface, covers 16 % of this area

Lower Walton Formation - shale, sandstone, conglomerate.

Lithology: shale; sandstone; conglomerate

Upper Walton Formation (Upper Devonian) at surface, covers 34 % of this area

Upper Walton Formation - shale, sandstone, conglomerate.

Lithology: shale; sandstone; conglomerate