These pictures of a Hexagonaria anna (Whitfield, 1973) coral fossil. It was found in the Bell Shale of the Traverse Group of Alpena, Michigan, USA. The coral lived in the Devonian Period.
On the bottom of the fossil are a number Aulopora coral fossils that grew on the Hexagonaria. Also there are a number of bryozoan colonies. Plus there is a Aulopora coral fossil found on the top of the coral.
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