Goniatite is any cephalopod mollusk belonging to the
order Goniatitida. Goniatites have coiled shells divided into chambers by
zigzag partitions. They first appeared in the upper Devonian period, about 350 million years ago. The group became extinct at the end
of the Permian period. They are useful as
zone fossils. Goniatites and ammonites belonged to the same subclass Ammonoidea.
|A goniatite fossil found in Morocco