"Augusta Member" "Aux Vases Sandstone" "Babylon Sandstone Member" "Backbone Limestone" "Bailey Limestone" "Bankston Fork Limestone Member" "Banner Formation" "Batavia Member" "Batestown Member" "Battery Rock Sandstone Member" "Baylis Formation" "Beaver Bend Limestone Member" "Beech Creek Limestone" "Beecher Member" "Belgium Member" "Bernadotte Sandstone Member" "Berry Clay Member" "Bethel Sandstone" "Beverly Tongue" "Bevier Coal Member or Bed" "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" "Cahokia Alluvium" "Calhoun Coal Member"