Period Group Unit Lithology Penn.   Pottsville Olean .   Quartz pebble conglomerate & sandstone, quartz pebble, conglomerate, sandstone & minor shale. Miss.   Pocono Knapp .   Dev. Upper Conewango   .   Shale & sandstone, scattered conglomerates. Conneaut Chadakoin .   Shale & siltstone, scattered conglomerates. Canadaway Undifferentiated1 .     Shale & siltstone Minor sandstone Perrysburg2 .     Shale & siltstone Minor sandstone West Falls Java Nunda Rhinestreet . Shale & siltstone Argilleceous limestone Sonyea Middlesex . Shale & siltstone Genesee   .   Shale with minor siltstone & limestone Middle   Tully . Limestone with minor siltstone & sandstone. Hamilton Moscow Ludlowville Skaneateles Marcellus . Shale with minor sandstone & conglomerate.   Onondaga .   Limestone Lower Tristates Oriskany   Sandstone Helderberg Manilius Rondout .   Limestone & dolostone Sil. Upper   Akron .   Dolostone Salina Camillus Syracuse Vernon . Shale, siltstone, anhydrite & halite Lockport Lockport . Limestone & dolostone Clinton Rochester Irondequoit .   Shale & sandstone Lower Sodus Reynales Thorold .   Limestone & dolostone Medina Grimsby Whirlpool . Sandstone & shale Quartz sandstone Ord. Upper   Queenston Oswego Lorraine Utica . Shale & siltstone with minor sandstone Middle Trenton - Black River Trenton Black River . Limestone and minor dolostone. Lower Beekmantown Tribes Hill Chuctanunda .   Limestone Camb. Upper   Little Falls Galway (Theresa) Potsdam . Quartz sandstone & dolostone; sandstone & sandy dolomite; conglomerate base PreCamb.   Gneiss, Marble, Quartzite, etc... .   Metamorphic & igneous rocks 1 - Includes: Glade, Bradford 1st, Chipmunk, Bradford 2nd, Harrisburg Run, Scio, Penny and Richburg. 2 - Includes: Bradford 3rd, Humphrey, Clarksville, Waugh & Porter, and Fulmer Valley.

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