6.2" Bumpy Douvilleiceras Ammonite Fossil

This is a large example of the ammonite Douvilleiceras mammilatum from the Mahajanga Province of Madagascar. It's Upper Cretaceous in age, or approximately 110 million years old. It still has much of it's shell and a mother-of-pearl type iridescence to it.

This ammonite is quite heavy, weighing nearly 4 lbs.