Some things lost, stay that way forever. Others rematerialize when and where you least expect them. Take Fernie, British Columbia’s ammonite for example. This 1.4-metre (five-foot), carnivorous cephalopod, which resembled a giant squid stuffed inside a curved shell, died in a shallow sea about 150 million years ago. It is assumed decomposition gases buoyed its massive shell, floating the corpse to a shoreline, where it was buried, deeply and literally, by the sands of time.