Category:Geologic formations of volcanic origin in the United States

• Geologic formations of volcanic orgin in California‎ (49 C)
• Geologic formations of volcanic origin in Colorado‎ (8 C)
• Geologic formations of volcanic origin in Idaho‎ (1 C)

A

• Ash Hollow Formation‎ (3 C, 9 F)

B

• Bluff Point Tuff‎ (2 C, 1 F)

C

• Cap Rock Member, Ash Hollow Formation‎ (1 C, 22 F)
• Cape Ann Plutonic Suite‎ (6 F)

H

• Huckleberry Ridge Tuff‎ (9 C, 18 F)

L

• Lava Creek Tuff‎ (10 C, 22 F)

M

• Mesa Falls Tuff‎ (3 C, 8 F)

O

• Ogallala Formation‎ (7 C, 9 F)

P

• Putney Volcanics‎ (9 F)
• Puye Formation‎ (2 C, 6 F)

S

• Sentinel Butte Formation‎ (8 C, 18 F)
• Stockdale Diatreme (Kansas)‎ (1 C, 1 F)

T

• Two Medicine Formation‎ (3 C, 6 F)