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Colorado City Formation

Colorado Formation}}The Colorado City Formation is a geologic formation in Texas. It preserves fossils dating back to the Triassic period.

Biochronological significance

The Otis Chalk localities that are situated in the Colorado City Formation form the basis of the Otischalkian Land Vertebrate Faunachron (LVF), which is defined by the first appearance of Parasuchus.

Vertebrate fauna