"Colonial coral (Columbus Limestone, Middle Devonian; Ohio, USA)."
James St. John, CC BY 2.0, via Wikimedia Commons or Flickr: https://flic.kr/p/26WcLcE
Colonial coral (Columbus Limestone, Middle Devonian; Ohio, USA)
(Orton Geology Museum collection, Ohio State University, Columbus, Ohio, USA) ----------------------------- This fossil coral is from the Columbus Limestone, a significant carbonate unit in the Devonian of central and northern Ohio.Flickr