Ordovician System
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Read about the Ordovician System
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Paleozoic Erathem
Cambrian System
Carboniferous System
Mississippian Subsystem
Pennsylvanian Subsystem
Devonian System
Ordovician System
Permian System
Silurian System
Ordovician System
Tippecanoe Sequence
Ordovician System
Cincinnatian Series
Richmondian Stage
Maquoketa Shale Group
Neda Formation
Brainard Shale
Girardeau Limestone
Fort Atkinson Limstone
Scales Shale
Clermont Shale Member
Maysvillian Stage
Elgin Shale Member
Edenian Stage
Orchard Creek Shale Member
Thebes Sandstone Member
Ottawa Limestone Megagroup
Cape Limestone
Champlainian Series
Trentonian Stage
Galena Group
Dubuque Formation
Kimmswick Subgroup
Wise Lake Formation
Stewartville Member
Sinsinawa Member
Dunleith Formation
Wyota Member
New London Member
Wall Member
Sherwood Member
Moredock Member
Rivoli Member
Mortimer Member
Fairplay Member
Eagle Point Member
Beecher Member
St. James Member
Buckhorn Member
Decorah Subgroup
Guttenberg Formation
Glenhaven Member
Garnavillo Member
Kings Lake Formation
Tyson Member
Mincke Member
Spechts Ferry Formation
Glencoe Member
Castlewood Member
Blackriveran Stage
Platteville Group
Plattin Subgroup
Quimbys Mill Formation
Strawbridge Member
Shullsburg Member
Hazel Green Member
Nachusa Formation
Everett Member
Elm Member
Eldena Member
Grand Detour Formation
Forreston Member
Victory Member
Hely Member
Clement Member
Stillman Member
Walgreen Member
Dement Member
Mifflin Formation
Briton Member
Hazelwood Member
Establishment Member
Brickeys Member
Blomeyer Member
Pecatonica Formation
Oglesby Member
Medusa Member
New Glarus Member
Dane Member
Chana Member
Hennepin Member
Ancell Group
Glenwood Formation
Joachim Dolomite
Harmony Hill Shale Member
Metz Member
Loughridge Sandstone Member
Matson Member
Nokomis Sandstone Member
Daysville Dolomite Member
Defiance Member
Kingdom Sandstone Member
Boles Member
Augusta Member
Abernathy Member
Dutchtown Limestone
Sharpsboro Member
Gordonville Member
St. Peter Sandstone
Starved Rock Sandstone Member
Tonti Sandstone Member
Kress Member
Sauk Sequence
Chazyan Stage
Everton Dolomite
Canadian Series
Prairie du Chien Group
Shakopee Dolomite
New Richmond Sandstone
Oneota Dolomite
Blodgett Member
Arsenal Member
Gunter Sandstone
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