Gastropods Identification of Asmari Formation in Shamsabad and Runiz Stratigraphic Sections in South- East of Shiraz (Fars Province)

Three rock units have been identified in Shamsabad and Runiz stratigraphic sections of Asmari Formation in internal Fars region. Gastropods of Shamsabad and Runiz stratigraphic sections belong to four orders, Mesogastropoda, Neogastropoda, Architaenioglossa, Sorbeoconcha.Seven genuses and three subgenus have been recognized in lower and middle parts. In general, four genuses and one subgenus of gastropods in lower part indicating the age of Chatian, two genuses and two subgenus in middle part are indicating the age of Aquitanian and a genus in upper part indicating the age of middle Eocene (lower boundary of Asmari Formation) has been observed with foraminifers species that include Somalina stefunini, Rhapydionina urensis. the age of Asmari Formation gastropods in the studied region is alike with associated foraminifera biozones that include, Nummulites fichteli – Nummulites intermedius – Nummulites vascus assemblage – zone, indicating the age of Chatian and Austroterillina howchini – Peneroplis evolutus assemblage – zone, indicating the age of Aquitanian. Gastropods recognized in sections,are listed below: Olivella sp., Mitra sp., Ampullina sp., Ampullospira sp., Campanile sp., Strombus sp., Natica sp., Tortoliva sp., Lithoconus sp., Dendroconus sp.