Trilobite Elrathia kingi

This is a nice collection of Tribolite Elrathia kingi. I actually recevied this set from a friend for my birthday years back.

From small to large.. the details of this fossilized trilobite specimen is very well preserved!

Trilobites ("three-lobes") are a well-known fossil group of extinct marine arthropods that form the class Trilobita. Trilobites first appear in the fossil record during the Early Cambrian period (540 million years ago) and flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, all trilobite orders, with the sole exception of Proetida, died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago.