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INDEX
D
- Decorah Subgroup
- Defiance Member
- Degonia Sandstone
- Dekoven Coal Member or Bed
- Delafield Member
- Delavan Member
- Delwood Coal Member
- Dement Member
- Derby-Doerun Member
- Desmoinesian Series
- Devonian System
- Dix Limestone Member
- Dolton Member
- Downeys Bluff Limestone
- Dresbachian Stage
- Drummond Member
- Dubuque Formation
- Duncan Mills Member
- Dunleith Formation
- Dutch Creek Sandstone Member
- Dutchtown Limestone
- Dykersburg Shale Member
E
E cont.
- Embayment Megagroup
- Eminence Formation
- Energy Shale Member
- Enion Formation
- Eocene Series
- Equality Formation
- Esmond Till Member
- Establishment Member
- Everett Member
- Everton Dolomite
- Excello Shale Member
- Exline Limestone Member
F
- Fairplay Member
- Farmdale Soil
- Farmington Shale Member
- Fern Glen Formation
- Finnie Sandstone Member
- Flannigan Coal Member
- Flat Creek Coal Member
- Ford Station Limestone Member
- Forreston Member
- Fort Atkinson Limstone
- Fort Payne Formation
- Fox Valley Member
- Fraileys Shale
- Francis Creek Shale Member
- Franconia Formation
- Franconian Stage
- Fredonia Limestone Member
- Friendsville Coal Member
- Fults Member
G
G cont.
- Galum Limestone Member
- Garnavillo Member
- Gasperian Stage
- Geneva Dolomite Member
- Genevievian Stage
- Gentry Coal Bed
- Gila Limestone Member
- Gimlet Sandstone Member
- Girardeau Limestone
- Glasford Formation
- Glen Dean Limestone
- Glen Park Formation
- Glenburn Till Member
- Glencoe Member
- Glenhaven Member
- Glenwood Formation
- Golconda Group
- Gordonville Member
- Goreville Limestone Member
- Grand Detour Formation
- Grand Tower Limestone
- Granger Sandstone Member
- Grassy Creek Shale
- Grassy Knob Chert
- Grayslake Peat
- Greenbush Coal Member or Bed
- Greenup Limestone Member
- Grigg tongue
- Grindstaff Sandstone Member
- Grove Church Shale
- Grover Gravel
- Gulfian Series