Sedimentology, depositional environment and sequence stratigraphy of the Asmari Formation (Oligocene-Lower Miocene), Gachsaran Area; SW Iran

This study investigates the depositional environment and sequence stratigraphy of the Asmari Formation (Oligocene-Miocene) in Gachsaran Area. The formation is carbonate sequence, which is laid down in the southern side edge Neotethys Ocean (Zagros area). The Asmari Formation represents sedimentation on a carbonate ramp. Seven major microfacies and three subfacies are recognized which include: MF-1) planktonic foraminifer wackestone-packstone, MF-2) nummulitic-bioclastic-corallinacean wackestone-packstone, MF-3) bioclastic grainstone, MF-4) ooid-grainstone, MF-5) bioclastic-miliolid-borelisid, MF-6) miliolid-intraclast-bioclast and MF-7) carbonate mudstones (laminated mudstone, fossiliferous mudstone and algal mudstones).