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- Historical:Abbott Formation
- Historical:Abernathy Member
- Historical:Abingdon Coal Member
- Historical:Absaroka Sequence
- Historical:Afton Soil
- Historical:Alexandrian Series
- Historical:Allard Limestone Member
- Historical:Allenby Coal Member
- Historical:Alto Formation
- Historical:Ancell Group
- Historical:Anna Shale Member
- Historical:Anvil Rock Sandstone Member
- Historical:Argyle Till Member
- Historical:Arsenal Member
- Historical:Ashmore Tongue
- Historical:Assumption Coal Member
- Historical:Athensville Coal Member
- Historical:Atokan Series
- Historical:Augusta Member
- Historical:Aux Vases Sandstone
- Historical:Babylon Sandstone Member
- Historical:Backbone Limestone
- Historical:Bailey Limestone
- Historical:Bankston Fork Limestone Member
- Historical:Banner Formation
- Historical:Batavia Member
- Historical:Batestown Member
- Historical:Battery Rock Sandstone Member
- Historical:Baylis Formation
- Historical:Beaver Bend Limestone Member
- Historical:Beech Creek Limestone
- Historical:Beecher Member
- Historical:Belgium Member
- Historical:Bernadotte Sandstone Member
- Historical:Berry Clay Member
- Historical:Bethel Sandstone
- Historical:Beverly Tongue
- Historical:Bidwell Coal Member
- Historical:Big Clifty Sandstone Member
- Historical:Big Creek Shale Member
- Historical:Bilyeu Member
- Historical:Birds Member
- Historical:Blackriveran Stage
- Historical:Blanding Formation
- Historical:Blocher Shale
- Historical:Blodgett Member
- Historical:Blomeyer Member
- Historical:Bogota Limestone Member
- Historical:Boles Member
- Historical:Bond Formation
- Historical:Bonpas Limestone Member
- Historical:Borden Siltstone
- Historical:Brainard Shale
- Historical:Brandon Bridge Member
- Historical:Breezy Hill Limestone Member
- Historical:Brereton Limestone Member
- Historical:Briar Hill Coal Member
- Historical:Brickeys Member
- Historical:Briton Member
- Historical:Browning Sandstone Member
- Historical:Brush Coal Member
- Historical:Buckhorn Member
- Historical:Buelter Member
- Historical:Bunje Limestone Member
- Historical:Burlington Limestone
- Historical:Burroughs Limestone Member
- Historical:Cahokia Alluvium
- Historical:Calhoun Coal Member
- Historical:Cambrian System
- Historical:Canadian Series
- Historical:Canton Shale Member
- Historical:Cape Limestone
- Historical:Capron Till Member
- Historical:Carbondale Formation
- Historical:Cardiff coal bed
- Historical:Carlinville Limestone Member
- Historical:Carmi Member
- Historical:Caseyville Formation
- Historical:Castlewood Member
- Historical:Cave Hill Shale Member
- Historical:Cayugan Series
- Historical:Cedar Bluff Limestone Group
- Historical:Cedar Valley Limestone
- Historical:Cenozoic Erathem
- Historical:Chalfin Member
- Historical:Champlainian Series
- Historical:Chana Member
- Historical:Chapel Coal Member
- Historical:Chapin Soil
- Historical:Charter Member
- Historical:Chazyan Stage
- Historical:Cheltenham Clay Member
- Historical:Chesterian Series
- Historical:Chouteau Limestone
- Historical:Cincinnatian Series
- Historical:Clayton Formation
- Historical:Clear Creek Chert
- Historical:Clement Member
- Historical:Clermont Shale Member
- Historical:Clore Formation
- Historical:Coffeen Limestone Member
- Historical:Coggan Member
- Historical:Cohn Coal Member
- Historical:Colchester Coal Member
- Historical:Conant Limestone Member
- Historical:Cooper Limestone Member
- Historical:Copperas Creek Sandstone Member
- Historical:Cora Limestone Member
- Historical:Coralville Member
- Historical:Covel Conglomerate Bed
- Historical:Cramer Limestone Member
- Historical:Crane Member
- Historical:Creal Springs Limestone Member
- Historical:Cretaceous System
- Historical:Croixan Series
- Historical:Crowleys Ridge Silt
- Historical:Curlew Limestone Member
- Historical:Cypress Sandstone
- Historical:Dane Member
- Historical:Danville Coal Member
- Historical:Davenport Member
- Historical:Davis Coal Member
- Historical:Davis Member
- Historical:Daysville Dolomite Member
- Historical:De Graff Coal Member
- Historical:De Long Coal Member
- Historical:Decorah Subgroup
- Historical:Defiance Member
- Historical:Degonia Sandstone
- Historical:Dekoven Coal Member
- Historical:Delavan Member
- Historical:Delwood Coal Member
- Historical:Dement Member
- Historical:Derby-Doerun Member
- Historical:Desmoinesian Series
- Historical:Devonian System
- Historical:Dix Limestone Member
- Historical:Dolton Member
- Historical:Downeys Bluff Limestone
- Historical:Dresbachian Stage
- Historical:Drummond Member
- Historical:Drury Shale Member
- Historical:Dubuque Formation
- Historical:Duncan Mills Member
- Historical:Dunleith Formation
- Historical:Dutch Creek Sandstone Member
- Historical:Dutchtown Limestone
- Historical:Dykersburg Shale Member
- Historical:Eagle Point Member
- Historical:Eau Claire Formation
- Historical:Edenian Stage
- Historical:Edgewood Formation
- Historical:Effingham Limestone Member
- Historical:Eldena Member
- Historical:Elgin Shale Member
- Historical:Elm Member
- Historical:Elmhurst Sandstone Member
- Historical:Elviran Stage
- Historical:Elwood Formation
- Historical:Embayment Megagroup
- Historical:Eminence Formation
- Historical:Enion Formation
- Historical:Eocene Series
- Historical:Equality Formation
- Historical:Esmond Till Member
- Historical:Establishment Member
- Historical:Everett Member
- Historical:Everton Dolomite
- Historical:Excello Shale Member
- Historical:Exline Limestone Member
- Historical:Fairplay Member
- Historical:Farmdale Soil
- Historical:Farmington Shale Member
- Historical:Fern Glen Formation
- Historical:Finnie Sandstone Member
- Historical:Flannigan Coal Member
- Historical:Flat Creek Coal Member
- Historical:Ford Station Limestone Member
- Historical:Forreston Member
- Historical:Fort Atkinson Limstone
- Historical:Fort Payne Formation
- Historical:Fox Valley Member
- Historical:Fraileys Shale
- Historical:Francis Creek Shale Member
- Historical:Franconia Formation
- Historical:Franconian Stage
- Historical:Fredonia Limestone Member
- Historical:Friendsville Coal Member
- Historical:Fults Member
- Historical:Galena Group
- Historical:Galesville Sandstone
- Historical:Galum Limestone Member
- Historical:Garnavillo Member
- Historical:Gasperian Stage
- Historical:Geneva Dolomite Member
- Historical:Genevievian Stage
- Historical:Gentry Coal Bed
- Historical:Gila Limestone Member
- Historical:Gimlet Sandstone Member
- Historical:Girardeau Limestone
- Historical:Glasford Formation
- Historical:Glen Dean Limestone
- Historical:Glen Park Formation
- Historical:Glenburn Till Member
- Historical:Glencoe Member
- Historical:Glenhaven Member
- Historical:Glenwood Formation
- Historical:Golconda Group
- Historical:Gordonville Member
- Historical:Goreville Limestone Member
- Historical:Grand Detour Formation
- Historical:Grand Tower Limestone
- Historical:Granger Sandstone Member
- Historical:Grassy Creek Shale
- Historical:Grassy Knob Chert
- Historical:Grayslake Peat
- Historical:Greenbush Coal Member
- Historical:Greenup Limestone Member
- Historical:Grindstaff Sandstone Member
- Historical:Grove Church Shale
- Historical:Grover Gravel
- Historical:Gulfian Series
- Historical:Gunn Member
- Historical:Gunter Sandstone
- Historical:Guttenberg Formation
- Historical:Hadley Gravel Member
- Historical:Haeger Member
- Historical:Hagarstown Member
- Historical:Hall Limestone Member
- Historical:Haney Limestone
- Historical:Hannibal Shale
- Historical:Hanover Limestone Member
- Historical:Hardinsburg Sandstone
- Historical:Harkness Silt Member
- Historical:Harmattan Till Member
- Historical:Harmony Hill Shale Member
- Historical:Harrodsburg Limestone Member
- Historical:Hazel Green Member
- Historical:Hazelwood Member
- Historical:Hegeler Till Member
- Historical:Hely Member
- Historical:Hennepin Member
- Historical:Henry Formation
- Historical:Hermon Coal Member
- Historical:Herrin Coal Member
- Historical:Hillery Till Member
- Historical:Hoing Sandstone Member
- Historical:Hombergian Stage
- Historical:Howardton Limestone Member
- Historical:Hulick Till Member
- Historical:Hunton Limestone Megagroup
- Historical:Inglefield Sandstone Member
- Historical:Ironton Sandstone
- Historical:Isabel Sandstone Member
- Historical:Jake Creek Sandstone Member
- Historical:Jamestown Coal Member
- Historical:Joachim Dolomite
- Historical:Joliet Formation
- Historical:Joppa Member
- Historical:Jordan Sandstone
- Historical:Jules Soil
- Historical:Kankakee Formation
- Historical:Karnak Limestone Member
- Historical:Kaskaskia Sequence
- Historical:Kellerville Till Member
- Historical:Kenwood Member
- Historical:Kenyon Member
- Historical:Keokuk Limestone
- Historical:Kerton Creek coal bed
- Historical:Kewanee Group
- Historical:Kewaunee Formation
- Historical:Kidd Member
- Historical:Kimmswick Subgroup
- Historical:Kinderhookian Series
- Historical:Kingdom Sandstone Member
- Historical:Kings Lake Formation
- Historical:Kinkaid Limestone
- Historical:Kiser Creek Member
- Historical:Knobs Megagroup
- Historical:Knox Dolomite Megagroup
- Historical:Kress Member
- Historical:La Salle Limestone Member
- Historical:Lacey Member
- Historical:Lacon Formation
- Historical:Lake Creek Coal Member
- Historical:Lake Forest Member
- Historical:Lake Michigan Formation
- Historical:Lake Michigan Member
- Historical:Lawson Shale Member
- Historical:Lee Center Till Member
- Historical:Lemont Formation
- Historical:Levias Limestone Member
- Historical:Levings Member
- Historical:Lierle Clay Member
- Historical:Lingle Formation
- Historical:Litchfield Coal Member
- Historical:Little Bear Soil
- Historical:Little Vermilion Limestone Member
- Historical:Livingston Limestone Member
- Historical:Lombard Dolomite Member
- Historical:Lonsdale Limestone Member
- Historical:Loughridge Sandstone Member
- Historical:Louisiana Limestone
- Historical:Loveland Silt
- Historical:Lovell Member
- Historical:Lowell Coal Member
- Historical:Lower Devonian Series
- Historical:Lusk Shale Member
- Historical:Mackinaw Member
- Historical:Macoupin Limestone Member
- Historical:Mahomet Sand Member
- Historical:Malden Till Member
- Historical:Mammoth Cave Limestone Megagroup
- Historical:Manitowoc Member
- Historical:Manley Coal Member
- Historical:Maquoketa Shale Group
- Historical:Marcus Formation
- Historical:Markgraf Member
- Historical:Markham Silt Member
- Historical:Marywood Member
- Historical:Mason Group
- Historical:Matson Member
- Historical:Mattoon Formation
- Historical:Mayfield Member
- Historical:Maysvillian Stage
- Historical:McClearys Bluff Coal Member
- Historical:McCormick Group
- Historical:McCraney Limestone
- Historical:McDonough Loess Member
- Historical:McLeansboro Group
- Historical:McNairy Formation
- Historical:McWain Sandstone Member
- Historical:Meadow Loess Member
- Historical:Mecca Quarry Shale Member
- Historical:Medusa Member
- Historical:Menard Limestone
- Historical:Meppen Limestone
- Historical:Merom Sandstone Member
- Historical:Mesozoic Erathem
- Historical:Metz Member
- Historical:Middle Devonian Series
- Historical:Mifflin Formation
- Historical:Millersville Limestone Member
- Historical:Mincke Member
- Historical:Misenheimer Shale Member