Polished Ammonite Split Pair - 3.913" Cleoniceras fossilrockcrystal Sidney and Creber

Sidney and Creber

These creatures were some of the most evolutionarily advanced members of the phytosaur family

glass-topped riker display boxes

with vertebrae over 5 inches in diameter

63" polished Cleoniceras fossil from Madagascar

Polished Ammonite Split Pair - 3.913" Cleoniceras fossilrockcrystal Sidney and CreberAmmonites are an extinct group of cephalopods that entered the fossil record 400 million years ago. This specimen is a 3. 913" 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