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INDEX
C
- 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
C cont.
D
D cont.
- 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