Three Gastropod (Cyclonema) Fossils Mounted On Shale - Ohio

This is a nice multiple plate of three Ordovician aged gastropod (Cyclonema bilix) fossils from the Arnheim Formation of Ohio. Mollusk shells are typically composed of a phosphatic substance called Aragonite. Unfortunately Aragonite does not preserve well in the Cincinnatian, so most gastropod fossils are internal molds, unlike this specimen. This piece has been cleaned under microscope using air abrasives.

All three of these gastropods were removed from the rock, cleaned and then remounted to this rock. The rock contains a variety of other marine fossil fragments. It comes with an acrylic display stand.