Polished Ammonite Split Pair - 3.544" Cleoniceras rockinabox The spine of a Tyrannosaurus

The spine of a Tyrannosaurus Rex was subject to tremendous force

The glass coating is very thin

the first trilobites emerged in the fossil record thanks to this evolutionary event

Lake Gosiute and Lake Uinta

Given the heft of the pendant

Polished Ammonite Split Pair - 3.544" Cleoniceras rockinabox The spine of a TyrannosaurusAmmonites are an extinct group of cephalopods that entered the fossil record 400 million years ago. This specimen is a 3. 544" 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