Category:Geologic formations of the United States

• Geologic formations of the United States by state (50 C)

.

• Rock formations of the United States (9 C, 13 P)

*

• Precambrian United States (1 C, 25 P)

+

• Geologic formations of Puerto Rico (3 C, 12 P)

C

• Cambrian United States (35 C, 11 P)
• Cenozoic United States (23 C, 2 P)

E

• Ediacaran United States (3 C, 3 P)
• Eocene United States (1 C, 17 P)

J

• Jurassic United States (23 C, 11 P)

M

• Mesozoic United States (22 C)
• Miocene United States (2 C, 24 P)

N

• Neogene United States (31 C, 19 P)

O

• Ordovician United States (34 C, 22 P)

P

• Paleogene United States (31 C, 24 P)
• Paleozoic United States (31 C, 5 P)
• Permian United States (20 C, 9 P)
• Pleistocene United States (1 C, 51 P)
• Pliocene United States (2 C, 13 P)

Q

• Quaternary United States (15 C, 10 P)

S

• Silurian United States (25 C, 15 P)

T

• Triassic United States (20 C, 9 P)

Σ

• United States geologic formation stubs (4 C, 154 P)

A

• Arkadelphia Marl

B

• Beaverdam Formation (Delmarva)
• Biscayne Aquifer
• Black Belt (geological formation)
• Boquillas Formation

C

• Castlegate Sandstone
• Citronelle Formation
• Cokedale Formation
• Collinsville Formation

F

• Fossil Hill Member
• Frontier Formation

H

• Hell Creek Formation
• Hosselkus Limestone

J

• Jordan Formation

L

• Lake Waco Formation

M

• Menefee Formation
• Mineralogy of the Pikes Peak Region
• Morrison Formation

N

• Nanjemoy Formation
• North Horn Formation

O

• Ojo Alamo Formation
• Old Red Sandstone

P

• Pajarito Formation
• Portland Formation
• Purisima Formation

S

• Shadow Lake Formation
• Shuttle Meadow Formation
• Smoky Hill Chalk
• St. Marys Formation
• Syracuse Formation

T

• Tioga Bentonites
• Tres Hermanos Formation
• Tullock Formation

W

• Wasatch Formation
• White River Formation
• Willwood Formation