systematic of albian - cenomanian gastropods and bivalves from the kazhdumi formation, zagros basin

The albian- cenomanian (kazhdumi formation) sediments from northeast of shiraz, zagros basin, represents a carbonate sedimentary succession and contain diverse gastropods and bivalves. detailed studies on 80 samples of invertebrate macrofauna on two stratigraphic sections led to recognized 2 species and 5 genera of gastropods and 7 species and 13 genera of bivalves assemblages. the abscence of large gastropods and bivalves fauna and abundance of suspension-feeders indicated instability of the substrate and a medium enrgy condition. from a palaeobiogeographic point of view, the fauna from the kazhdumi formation were similar to the central iran and north jordan and wadi qena (egypt).