fossilized fossils of the brachiopod choristites. palentology, 400 million year old moluska shell in a limestone stone

fossil marine rock invertebrates fossils embedded devonian sedimentary brachiopods sea science prehistoric paleontology ancient nature natural geology animal white wildlife skeleton texture fossilized shells closeup shell animals conceptual bed seashells eons mineral outdoors sciences paleozoic era quarry object old precious shiny stone surface choristites limestone