The small holes covering most of this Pleistocene
limestone from the Bahamas were excavated by clionid sponges,
producing a trace fossil known as Entobia. In the center
of the image an articulated bivalve nestles within the gaping
valves of another bivalve. This outer bivalve is probably a lithophagid
which drilled the boring in the limestone and then died in place,
providing a home for the nestler.
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