Check the listing for details. Eryops Tooth Fossil Pre Dinosaur in a Great Display Case. Condition: Used. Listed at 21.99 USD. Its large skull had thick and uneven bones, with wrinkles. The eye sockets were large and directed upward. Large and pointed teeth grew along the margins of the jaws and on the palate. The skin bore bony nodules that probably provided a sort of protective armor against predators.