Two Cretaceous Fossil Oysters (Rastellum) - Madagascar

These are Cretaceous aged fossil oyster of the species Rastellum carinatum from Mahajanga Province, Madagascar. This species had wide, angled ribs that have led to it being called the 'denture clam'. The zig-zag joint between the two shells stopped coarse dirt and debris entering the shell and damaging its soft body. Like modern oysters it lived in shallow coastal waters including the intertidal zone (the area between high and low tide) and fed on food particles that it filtered out of the sea water. The larger of the two attached oysters is 2.8" wide.