![]() Understanding of the orientation of these banks has been significantly assisted by micropalaeontological analysis of the rudist-associated sediment, but may be additionally enhanced by the study of Recent large bivalves, such as the ‘fan mussel’ Pinna spp. The rudist banks caused differentiation of an earlier carbonate platform into lagoon, back-bank, bank, fore-bank and open marine environments. The favourable hydrocarbon reservoir properties of these carbonates are primarily attributed to the presence of the rudists and their associated debris, which accumulated along the margins of an intra-shelf basin. ![]() Within the Arabian Peninsula, the Shu’aiba Formation is one of three Cretaceous carbonate formations in which rudist bivalves are an important component.
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