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INDEX
B
- Bidwell Coal Member
- Big Clifty Sandstone Member
- Big Creek Shale Member
- Bilyeu Member
- Birds Member
- Blackriveran Stage
- Blanding Formation
- Blocher Shale
- Blodgett Member
- Blomeyer Member
- Bogota Limestone Member
- Boles Member
- Bond Formation
- Bonpas Limestone Member
- Borden Siltstone
- Brainard Shale
- Brandon Bridge Member
- Breezy Hill Limestone Member
- Brereton Limestone Member
- Briar Hill Coal Member
- Brickeys Member
- Briton Member
- Brush Coal Member
- Buckhorn Member
- Buelter Member
- Bunje Limestone Member
- Burlington Limestone
- Burroughs Limestone Member
C
C cont.
- Cape Limestone
- Capron Till Member
- Carbondale Formation
- Cardiff coal bed
- Carlinville Limestone Member
- Caseyville Formation
- Castlewood Member
- Cave Hill Shale Member
- Cayugan Series
- Cedar Bluff Limestone Group
- Cedar Valley Limestone
- Cenozoic Erathem
- Chalfin Member
- Champlainian Series
- Chana Member
- Chapel Coal Member
- 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
C cont.
- 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
- Dane Member
- Danville Coal Member
- 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