The Cambrian Explosion brought new life and diversity to the ocean. 521,000,000 years ago, the first trilobites emerged in the fossil record thanks to this evolutionary event. With a tough exoskeleton, trilobites were one of the earliest known arthropods and quickly spread across the planet thanks to their incredible adaptability.

This specimen is a complete 4.67" trilobite fossil from the Elrathia kingii species, recovered from Utah's Wheeler Shale Formation. It dates to the Cambrian Period, over 500,000,000 years ago.