This alien-looking trilobite, known as Ceratarges ziregensis, has a strikingly otherworldly appearance. It's difficult to believe that this creatur...

Natural trilobite on its original fossil matrix. The Asaphid trilobites include some of the most extreme trilobite adaptations known, and the group...

Fossilized ammonite halves which reveals the internal chambers lined with calcite crystals. The ammonite has been naturally replaced by calcite wit...

Measuring 40ft (12m) in length and weighing upwards of 14 tons, Tyrannosaurus rex was one of the largest and most powerful terrestrial predators in...