Trilobites are extinct marine arthropods that widely populated the planet before undergoing mass extinction about 252 million years ago. They were a widely diversified genus that left a significant fossil record for study. The Trilobite on Matrix are uncovered fossils from Morocco whose rock casing is smoothed to increase the prominence of the Trilobite fossil. Each piece is unique and shaped based on the formation in which it was found. Available in large and small.