Trilobites

Trilobites are among the most iconic and diverse fossils, representing an extinct class of marine arthropods that thrived for over 270 million years. Their fossils range from less than a centimeter to more than 70 centimeters in length, and their segmented bodies, compound eyes, and intricate exoskeletons make them favorites among paleontologists and collectors alike. Trilobites lived in marine environments, with some species swimming, others burrowing, and many crawling along the sea floor.

The evolutionary story of trilobites is remarkable—they first appeared in the early Cambrian period, about 550 million years ago, and survived until the end of the Permian, around 250 million years ago. Their abundance and diversity make them important index fossils, helping geologists date the rocks in which they are found. Studying trilobites provides insights into ancient ecosystems, evolutionary biology, and the dramatic changes that shaped life on Earth. If you’re captivated by the mysteries of ancient oceans, trilobites are a gateway to exploring the earliest chapters of animal evolution.

Both Morocco and Ohio are famous for their trilobite fossils. In fact, the trilobite is the state fossil of Ohio, Wisconsin, and Pennsylvania.