• Mississippian United States (6 C, 35 P)
• Pennsylvanian United States (3 C)

A

• Carboniferous Alabama (7 P)
• Carboniferous Alaska (8 P)
• Carboniferous Arizona (12 P)
• Carboniferous Arkansas (2 C, 3 P)

C

• Carboniferous California (2 P)
• Carboniferous Colorado (1 C, 13 P)

G

• Carboniferous Georgia (U.S. state) (6 P)

I

• Carboniferous Idaho (9 P)
• Carboniferous Indiana (1 C, 30 P)
• Carboniferous Iowa (1 C, 20 P)
• Carboniferous Illinois (1 C, 41 P)

K

• Carboniferous Kansas (63 P)
• Carboniferous Kentucky (26 P)

M

• Carboniferous Maryland (4 P)
• Carboniferous Michigan (13 P)
• Carboniferous Missouri (2 C, 24 P)
• Carboniferous Montana (12 P)

N

• Carboniferous geology of Nebraska (19 P)
• Carboniferous geology of Nevada (14 P)
• Carboniferous geology of New Mexico (1 C, 6 P)
• Carboniferous geology of New York (state) (1 P)
• Carboniferous North Dakota (1 P)

O

• Carboniferous Ohio (19 P)
• Carboniferous Oklahoma (2 C, 38 P)

P

• Carboniferous geology of Pennsylvania (16 P)

R

• Carboniferous geology of Rhode Island (1 P)

S

• Carboniferous South Dakota (2 P)

T

• Carboniferous Tennessee (8 P)
• Carboniferous Texas (36 P)

U

• Carboniferous geology of Utah (22 P)

V

• Carboniferous geology of Virginia (21 P)

W

• Carboniferous geology of Wyoming (2 P)
• Carboniferous West Virginia (26 P)

*

• Mississippian (geology)
• Pennsylvanian (geology)

A

• Appalachian Plateau

D

• Dorycordaites

E

• Edaphosaurus

H

• Halgaitosaurus
• Helenodora

P

• Permian Basin (North America)
• Pittsburgh coal seam
• Pleurodictyum

R

• Rasstriga

S

• Sphenacodon

T

• Triodus