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Colorado City 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
, which is defined by the
first appearance
of
Parasuchus
.
Vertebrate
fauna