This Specimen has been sold.
1.3" Cruziana (Fossil Trilobite Trackway) - Missouri
This is a plate of fossil trackways (cruziana) from a burrowing trilobite, collected near Kansas City, Missouri. These are trackways preserved in a section of rock and would be Pennsylvanian in age. The longest trackway is 1.3" long and the rock measures 3.6 x 2".
Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago). They were one of the most successful of the early animals on our planet with over 25k currently described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left an excellent fossil record.