4.2" Plate of Partial Trilobite (Kaskia) Fossils - Illinois

Plate of Partial Trilobite (Kaskia) Fossils - Illinois #251245

This is a 4.2" wide plate of partial Kaskia chesterensis trilobite fossils from the Ridenhower Formation of Illinois. These fossils are Upper Mississipian in age or approximately 325 million years old. Finding complete specimens of this species is fairly uncommon.

It comes with an acrylic display stand.

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: over 25,000 species have been described, filling nearly every evolutionary niche. Due in large part to their hard exoskeletons (shells), they left an excellent fossil record.