Mishan Formation (Middle Miocene) is the middle part of Fars Group. To determine its facies, sedimentary environments and sequence stratigraphy, this formation has been studied in three sections in the west of Fars and one section in the east of Boushehr.
Mishan Formation consists of carbonate and siliciclastic facies deposited in a Carbonate Rimmed Shelf. Two sequences with both type 1 and type 2 sequence boundaries were recognized with in the deposits that are in accordance with a part of Tejas mega sequence (TB2). The age of this formation is referred to the second epoch of Middle Miocene (Serravallian).