Geologic units in Monroe county, New York

Queenston Shale (Upper Ordovician) at surface, covers 30 % of this area

Queenston Shale

Camillus, Syracuse, and Vernon Formations (Upper Silurian) at surface, covers 18 % of this area

Shale, dolostone, salt, and gypsum.

Vernon Formation (Upper Silurian) at surface, covers 13 % of this area

Dhale, dolostone.

Lockport Group (Upper Silurian) at surface, covers 12 % of this area

Oak Orchard and Penfield Dolostones; both replaced eastwardly by Sconondoa Formation-limestone, dolostone.

Lockport Group (Upper Silurian) at surface, covers 6 % of this area

Consists of: Guelph, Oak Orchard, Eramosa, and Goat Island Dolostones; Gasport Limestone-local bioherms.

Akron Dolostone (Upper Silurian) at surface, covers 6 % of this area

Bertie Formation - dolostone, shale.

Decew Dolostone and Rochester Shale (Lower Silurian) at surface, covers 3 % of this area

Decew Dolostone and Rochester Shale

Irondequoit Limestone thru Kodak Sandstone (Lower Silurian) at surface, covers 3 % of this area

Includes: Irondequoit Limestone, Williamson Shale; Wolcott Furnace Hematite; Wolcott Limestone; Sodus Shale; Bear Creek Shale; Wallington Limestone; Furnaceville Hematite; Maplewood Shale; Kodak Sandstone.

Medina Group (Lower Silurian) at surface, covers 2 % of this area

Consists of: Thorold Sandstone; Grimsby Formation-sandstone, shale; Power Glen and Cabot Head Shales; Whirlpool Sandstone.

Onondaga Limestone (Middle Devonian) at surface, covers 2 % of this area

Seneca, Morehouse (cherty), and Nedrow Limestone Members, Edgecliff cherty Limestone Member, local bioherms.

Decew Dolostone and Rochester Shale (Lower Silurian) at surface, covers 2 % of this area

Decew Dolostone and Rochester Shale

Camillus and Syracuse Formations (Upper Silurian) at surface, covers 0.9 % of this area

Shale, dolostone, gypsum, salt.

Medina Group (Lower Silurian) at surface, covers 0.9 % of this area

Grimsby Formation-sandstone, shale.

Irondequoit Limestone thru Kodak Sandstone (Lower Silurian) at surface, covers 0.8 % of this area

Includes: Irondequoit Limestone, Rockway Dolostone, Hickory Corners Limestone, Neahga Shale, and Kodak Sandstone.

Onondaga and Bois Blanc Limestones (Middle Devonian) at surface, covers 0.7 % of this area

In New York: Onondaga Limestone-Seneca, Morehouse (cherty), and Clarence Limestone Members, Edgecliff cherty Limestone Member, local coral bioherms; Bois Blanc Limestone-sandy, thin, discontinous. In Ontario: Dundee Limestone; Lucas Formation-dolostone, limestone (Anderdon); Amherstburg Formation-limestone, dolostone, sandstone (Sylvania); Bois Blanc Formation-dolostone, limestone, sandstone (Springvale).

Marcellus Formation (Middle Devonian) at surface, covers 0.2 % of this area

In west: Oatka Creek Shale Member; In east: Cardiff and Chittenango Shale Members, Cherry Vale Limestone and Union Springs Shale Members.

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

Levanna Shale, Stafford Limestone Members.

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

Oatka Creek Shale Member.