systematics and palaeoecology of late aptian-early cenomanian oysters (families: gryphaeidae, ostreidae, palaeolophidae) from northwest of kerman (kuhbanan region)

for study of systematic and palaeoecology of mid-cretaceous oysters, the basab section, with 380 m thickness, west of kuhbanan, northwest of kerman, was measured and sampled. the section comprises a high diverse fauna (macro and microfossils), such as echinoids, bivalves, oysters, brachiopods, gastropods, corals, ammonites, foraminifers and ostracods. the fossils indicate late aptian- early cenomanian age for the studied section. eleven genera and species of mid-cretaceous oysters are reported for the first time from the region. the fossils assemblages show a shallow and favorable condition during the deposition of the strata. the study of the oysters indicates that the peak of abundance of the fossils correlates with high values of δ13c curve. this implies deposition of high amount of organic carbon, low oxygen condition, elimination of other taxa and opportunistic character of the oysters.