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Belemnitida
Belemnitida
(or
belemnites
) is an
extinct
order
of
cephalopods
which existed during the
Mesozoic era
, from the
Hettangian
age of the Lower
Jurassic
to the
Maastrichtian
age of the Upper
Cretaceous
. The belemnite is the
state fossil
of
Delaware
.
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