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Zitai Formation
The
Zitai
Formation
is a
geological sequence
of
Middle Ordovician
origin
, that occurs along the
southeastern
edge
of the
Yangtze Platform
in
southern China
. It is a purple-red
limestone
with a few interspersed
yellow-green
shale
beds
. It
contains
a
fossil
fauna
dominated
by
trilobites
and
nautiloids
.