The World Around Us

Trilobite (Phacops rana) in the folded position. The eye can be clearly seen.  From an outcrop of the Middle Devonian Mahantango Formation, Pennsylvania.

Trilobite (Phacops rana) in the folded position which it adopted to protect itself from predators. The eye and its lenses can be clearly seen. From an outcrop of the Middle Devonian Mahantango Formation near Milesburg, Pennsylvania.

Credit: Photo: James Stuby.