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the true terror of these creatures could be found in their teeth
The nacre is rich in aragonite
Individually numbered Age of Dinosaurs were limited to our Kickstarter backers
Above: STS-51L crew members Michael J
Polished Ammonite Split Pair - SOLD 4.51" Cleoniceras rockinaboxcleoniceras the true terror of theseAmmonites are an extinct group of cephalopods that entered the fossil record 400 million years ago. This specimen is a 4. 51" polished Cleoniceras fossil from Madagascar. The fossil has been split into a paired set to showcase the beautiful internal chambers of the shell. These internal chambers are called septa and the ammonite could fill them with air in order to float through the ocean like a balloon. After millions of years, they are now
