Category:Mudstone formations in the United States

• Mudstone formations in the United States by state (43 C)

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• Claystone formations in the United States (4 C)
• Shale formations in the United States (68 C, 13 F)

G

• Galisteo Formation (5 F)

H

• Hell Creek Formation (7 C, 68 F)

I

• Iberville Formation (2 C, 2 F)

P

• Prairie Evaporite Formation (5 F)

S

• Spence Shale (2 C, 2 F)
• Summerville Formation (4 C, 6 F)

T

• Three Forks Group (5 C, 1 F)

W

• Wasatch Formation (12 C, 11 F)
• Wheeler Shale (5 C, 20 F)