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3 ammonites

Ammonites were one of the most successful animals of all time. As a group they roamed all of the earth's oceans for over 350 million years. During that time they thrived in huge numbers and thousands of different species. 

Ammonite "Button"
Goniatite, Polished
Ammonite Pendant
Ammonite Split Pair 3-4cm S.17
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Ammonite Split Pair 4-5 cm C
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Ammonite Split Pair 4-5 cm D
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Ammonite Split Pair 4-5 cm K
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Perisphinctes Ammonite 2.5 inch
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Ammonites Classroom Pack 20
$18.00 $22.00
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Some of our ammonite fossils for sale have been polished or split in half to reveal the inner chambers filled with an infinite variety of colors, designs and even crystal formations.

The pyritized ammonites that come from eastern Europe and Russia look as if sculpted from silvery minerals aligned along the septa with crystal caverns in between.

The large display ammonites from Morocco are impressive for their shear size and of course the price. They're all so wonderful, you may have trouble choosing which to look at first. The ammonites we have for sale have so many remarkable qualities. Each variety and species reads like a travelogue of ancient oceans. Their widespread presence and diversity of spiecies make ammonites useful in dating rock layers. Click on one of the sub-catagories listed below to find the ammonite for you.

When Did Ammonites Live?

Ammonites first show up in the fossil record during the Devonian Period. They were a wildly successful animal, plentiful and diverse. Some ammonites were just a few milimeters across. The largest species could be over a meter across! They went extinct along with the dinosaurs at the end of the Cretaceous Period.

The Ammonite Timeline

What is An Ammonite?

Ammonites belong to the class of animals called cephalopods and form the sub-class Ammonoidea that appeared in the fossil record during the Devonian Era. They are related to squid and octopus. The nautilus is their closest living relative.

ammonite suture patterns
Suture Patterns
ammonite drawing

Ammonite suture patterns All of these species fall into 3 orders based on the shape of the septa, Goniatitida, Ceretida, and Ammonitida.You can see examples of these 3 septe shapes at the right.

The ammonite shell had sections, with the living animal occupying only the section of the shell closest to the head. As the soft-bodied ammonite got larger, it grew a new shell section and sealed off the old one with a layer called the septa.

The shape of the septa varied from species to species. They grew more complex shapes over time from a smooth curve in the early Paleozoic Era to complexly convoluted in the Jurassic and Cretaceous Periods.

The old sections were connected by a tube called a siphuncle. Using the siphuncle the ammonite could adjust its bouyancy to move higher or lower in the water table. It did this by pumping gases or liquids into the old chambers. Because all ammonites were carnivores this helped them find better hunting grounds. The ammonites became extinct 65 million years ago during the great extinction at the end of the Cretaceous Period.You can learn more about ammonites here

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INTERESTED IN MORE INFORMATION? IF SO, YOU MAY WANT TO CHECK OUT OUR OTHER SITES: - An educational site about fossils and geologic time - An educational site about rocks, minerals, and geology.

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