Ammonite - half Madagascan Ammonite

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Ammonite - half Madagascan Ammonite From Madagascar

Approximately 110 Million Years, Cretaceous Period.

This Ammonite has been cut in half and polished, showing the chambers inside.

These Ammonites halves are various sizes, one will be selected specially for your order.



Ammonites are an extinct subclass of the Cephalopod class of the Phylum Mollusca (Mollusks).  Cephalopods, were free swimming mollusks, 
rather than attachingthemselves to rocks; like - Pelecypods or bottom dwelling Gastropods - Mollusks.  Present-day Cephalopods include the Octopus, Squid and Nautilus.

Fossil Records show that Ammonites first appear during the Devonian Period. 415 million years ago, reaching their 
greatest numbers during the mesozoic period (252 to 66 million years ago).  Ammonites disappeared during the same 
extinction event that killed off the dinosaurs at the end of the Cretaceous Period (65 million years ago).

 What is known about ammonites is primarily based on the now living nautilus, which has a similar appearance to the Ammonites.

- Ammonites were most likely carnivorous or fed on carrion. (dead and decaying flesh). 

 - Their chambered shells are found today, while their soft bodies,which occupied the largest and outermost chambers, are gone. The plates which divide the chambers, 
are called the septa and are highly visible in specimens which have been cut in half. 

 - Ammonites had a tube called a siphuncle, which carried water from outside the shell to the chambers, which enabled them to control the amount
 of air in their shell to affect their buoyancy and was also used to propel the ammonite forward.

  

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