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- Abbott Formation
- Abernathy Member
- Abingdon Coal Member
- Absaroka Sequence
- Afton Soil
- Alburnett Formation
- Alexandrian Series
- Allard Limestone Member
- Allenby Coal Member
- Alto Formation
- Alum Cave Limestone Member
- Ancell Group
- Anna Shale Member
- Antioch Limestone Member
- Anvil Rock
- Anvil Rock Sandstone Member
- Argyle Till Member
- Arsenal Member
- Ashmore Tongue
- Assumption Coal Member
- Athensville Coal Member
- Atokan Series
- Augusta Member
- Aux Vases Sandstone
- Aux Vases lime
- Babylon Sandstone Member
- Backbone Limestone
- Bailey Limestone
- Bankston Fork Limestone Member
- Banner Formation
- Barlow
- Basal Golconda
- Batavia Member
- Batestown Member
- Battery Rock Sandstone Member
- Baylis Formation
- Beaucoup
- Beaver Bend Limestone Member
- Beech Creek Limestone
- Beecher Member
- Belgium Member
- Bellair 500
- Bellair 800
- Bellair 900
- Benoist
- Bernadotte Sandstone Member
- Berry Clay Member
- Bethel Sandstone
- Beverly Tongue
- Bevier Coal Member or Bed
- Bidwell Coal Member
- Biehl
- Big Clifty
- 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
- Bridgeport
- Briton Member
- Browning
- Browning Sandstone Member
- Brush Coal Member
- Buchanan
- Buckhorn Member
- Bucktown Coal Member
- Buelter Member
- Bunje Limestone Member
- Burlington Limestone
- Burroughs Limestone Member
- Burtschi
- Cahokia Alluvium
- Calhoun Coal Member
- Cambrian System
- Canadian Series
- Canteen member
- Canton Shale Member
- Cape Limestone
- Capron Till Member
- Carbondale Formation
- Carboniferous System
- Cardiff coal bed
- Carlinville Limestone Member
- Carlyle
- Carmi Member
- Carper
- Casey
- Caseyville Formation
- Castlewood Member
- Cave Hill Shale Member
- Cayugan Series
- Cedar Bluff Limestone Group
- Cedar Valley Limestone
- Cenozoic Erathem
- Chalfin Member