A very fine complete specimen showing the plates and pore pairs well. In this specimen the sutures between the plates form straight lines down the side of the test. This feature, which shows very clearly, is an important zonal indicator and is characteristic of the upper third of the Coranguinium Zone and the lower two thirds of the Uintacrinus Zone. From the Santonian Alkerden Pit, Dartford, Kent, England.
Size: 70 mm
Size: 70 mm