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INDEX
C
- Chapin Soil
- Charter Member
- Chazyan Stage
- Cheltenham Clay Member
- Chesterian Series
- Chouteau Limestone
- Cincinnatian Series
- Clayton Formation
- Clear Creek Chert
- Clement Member
- Clermont Shale Member
- Clore Formation
- Coffeen Limestone Member
- Coggan Member
- Cohn Coal Member
- Colchester Coal Member
- Conant Limestone Member
- Cooper Limestone Member
- Copperas Creek Sandstone Member
- Cora Limestone Member
- Coralville Member
- County Line (Alburnett) silt
- Covel Conglomerate Bed
- Coxville Sandstone Member
- Cramer Limestone Member
- Crane Member
- Creal Springs Limestone Member
- Cretaceous System
- Croixan Series
- Crowleys Ridge Silt
- Curlew Limestone Member
- Cypress Sandstone
D
D cont.
- Davenport Member
- Davis Coal Member or Bed
- Davis Member
- Daysville Dolomite Member
- De Graff Coal Member
- De Long Coal Member
- 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.
- Eldena Member
- Elgin Shale Member
- Elm Member
- Elmhurst Sandstone Member
- Elviran Stage
- Elwood Formation
- 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