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- Abandoned Names
- Abbott Formation
- Absaroka Sequence
- Alburnett Formation
- Alexandrian Series
- Ancell Group
- Atokan Series
- Aux Vases Sandstone
- Banner Formation
- Baylis Formation
- Bentonite
- Blackriveran Stage
- Blanding Formation
- Bond Formation
- Borden Siltstone
- Bulletin 104
- Bulletin 94
- Bulletin 95
- Cambrian System
- Canadian Series
- Carbondale Formation
- Caseyville Formation
- Cedar Bluff Limestone Group
- Cedar Valley Limestone
- Cenozoic Erathem
- Champlainian Series
- Chazyan Stage
- Chert
- Chert Gravel
- Chesterian Series
- Cincinnatian Series
- Circular 605
- Clay
- Clayton Formation
- Clore Formation
- Coal
- Conglomerate
- Cretaceous System
- Croixan Series
- Croxian Series
- Decorah Subgroup
- Desmoinesian Series
- Devonian System
- Dolomite
- Dresbachian Stage
- Dunleith Formation
- Dutchtown Limestone
- Eau Claire Formation
- Edenian Stage
- Edgewood Formation