Reply To: Ordovician/Silurian Canal Rocks Homepage › Forums › What Is It? › Ordovician/Silurian Canal Rocks › Reply To: Ordovician/Silurian Canal Rocks January 29, 2018 at 12:29 pm #30472 Inkar ArzahParticipant What is this part circled in red? Is it a crown? Attachments:You must be logged in to view attached files.