Ammonites
are extinct cephalopods (class Cephalopoda) as are the modern-day squid,
octopus, and nautilus. Various types of
Ammonites lived over a long time range, 400 to 65 million years ago, and
therefore have a relatively large amount of orders and suborders, which means
there are a lot different types of Ammonite fossils available.
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| Ammonite septa & chambers |
It is
believed that the age of an Ammonite at death is estimated from the number of
septa it has. Septa are the dividing
walls between the chambers of the shell.
The septa along with the suture (where the septa joins the outer wall)
and the siphuncles (tubular outer rim connecting the chambers) determine the
orders and species.
Ammonites are
named for their spiral shaped shells, which resemble the ram’s horns of the Egyptian
god Amun.by Amanda Rice, Resident Geologist, Mama's Minerals
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