Reply To: Is this a cast fossil or a rock? Homepage › Forums › What Is It? › Is this a cast fossil or a rock? › Reply To: Is this a cast fossil or a rock? April 26, 2018 at 3:32 am #35467 Greg MolParticipant Blue Ridge province of GA. Not known for fossils. Is this a mineralized blood vessel?? Attachments:You must be logged in to view attached files.