Category:Triassic United States
gGologic formations of the {{C|Triassic|Triassic Period}}, in {{C|Mesozoic United States|Mesozoic Era United States}}, North America.
{{category pair|Permian United States|Jurassic United States}}
gGologic formations of the {{C|Triassic|Triassic Period}}, in {{C|Mesozoic United States|Mesozoic Era United States}}, North America.
{{category pair|Permian United States|Jurassic United States}}