The ammonite exhibits vibrant green outer shell which is unique to this location and fortuitously is in association of a fine single valve of the bivalve mollusc Cardinia gigantea genus. The bed is filled throughout with several other types of fossil shell, Tancredia and Cardinia listeri and Cardinia hybrida.
The genus of Cardinia bivalves numbered over one hundred different varieties, bivalves are a distinct group of mollusc having two valves to each single animal or shell and heterodont, internal teeth or ridges essential in keeping the clam’s bivalves closed tight shut as a protection against predation. The Cardinia were seabed dwellers, burying themselves in the sediment for protection but also to feed on plankton and organic matter. Being filter feeders they used feathery like structures to separate organic matter from seawater.
The fossils have absorbed calcites in the oolitic fossil bed, through a process of a metamorphic transformation, heavily mineralised water permiating through the tissue of the shell, in a cell by cell process, leaving behind minerals which have grown, solidifying and creating a fossil shell, this giving the attractive colouration overall.
The quarries which once gave up these ancient molluscs are now as extinct as the fossils it once produced, great quantities of ammonites, during the heyday of collecting were uncovered. The days when continental fossickers raided several sites in England, however collecting is no longer viable. The iconic quarries were eventually filled decades ago, the fossil material which once originated from this location is becoming increasingly difficult to obtain throughout the UK fossil scene.