3.35" Polished Fossil Horn Coral - Morocco
This is a polished piece of Devonian aged horn coral from the Western Sahara of Morocco.
Horn coral or Rugose coral first appeared in the geological record 488 million years ago and went extinct during the great Permian extinction 251 million years ago. They get their name from the hornlike structures built by the coral animal. They are very often used as an index fossil to help correlate the geological age of different formations.