It’s Trilobite Tuesday! The fossilized remains of this graceful Dionide from Portugal’s Valongo Formation are both academically significant and an example of natural art. One of the most fascinating Ordovician-age trilobite sites in the world, the Valongo Formation is known for producing jumbo-sized specimens. In fact, one record-holding trilobite from this site is estimated to have been 30 in (0.8 m) long… a world record.

















