Orthacanthus/Xenacanths Shark skeleton Triceratops bony crest was as big

bony crest was as big or bigger than the rest of its skull and may have been used to produce sounds

It was not until

but this has not been determined with certainty

The area covered by these lakes (Fossil

Orthacanthus/Xenacanths Shark skeleton Triceratops bony crest was as bigOrthacanthus is an extinct genus of fresh water shark from a family of prehistoric sharks known as Xenacanths. Members of the genus had a long spine growing from the back of their skull and a very long dorsal fin, which ran all along its back giving it an eel like appearance. About 260 million years ago, Orthacanthus was the terror of freshwater swamps and bayous in Europe and North America. Its body reached nearly 10 feet (3 meters) in length and its