This is an interesting fossil - it's a fossilized dorsal fin spine from HYBODUS, an extinct shark that lived during the Cretaceous period approximately 110 million years ago. This shark had 2 dorsal fins, each with a bony spine like this one, that is thought to have served a defense purpose for the shark. This spine measures approximately 6.5 inches long, and it was found in Morocco, North Africa.We have a variety of fossils available so be sure to check out our other items!Fossils, Meteorites, & More