The Pir-Sabz Section of the Asmari Formation is located in the Interior Fars province, Zagros Basin (Iran). The Asmari Formation at the study area is 312 m in thickness and formed by massive bedded limestone. According to the identified index microfossils, three Oligocene assemblage biozones were recorded: 1) Globigerina spp., 2) Lepidocyclina – Operculina – Ditrupa, and 3) Archaias asmaricus – Archaias hensoni. Twelve facies types were recognized according to their texture, occurrence and abundance of foraminifera, scleractinian corals and other skeletal grains: F1 Bioclastic planktonic foraminiferal wackestone–packstone, F2 Bioclastic planktonic foraminiferal echinoid packstone, F3 Bioclastic Operculina packstone, F4 Bioclastic Lepidocyclinidae packstone–rudstone, F5 Bioclastic coralline algal Lepidocyclinidae packstone–rudstone, F6 Bioclastic Lepidocyclinidae – Nummulitidae wackestone–packstone–grainstone, F7 Bioclastic Lepidocyclinidae – Neorotalia – coral packstone–rudstone, F8 Coral boundstone, F9 Bioclastic porcellaneous foraminifera – coral packstone, F10 Bioclastic coralline algal bryozoan wackestone–packstone, F11 Bioclastic benthic foraminifera (perforate and imperforate) wackestone–packstone, and F12 Bioclastic benthic foraminifera (imperforate) wackestone–packstone. From the base to the top of the section the facies types indicate: F1 aphotic zone and outer shelf; F2 aphotic to oligophotic zones on the outer and middle shelf (distal); F3 and F4 oligophotic zone and distal middle shelf; F5, F6 and F7 mesophotic zone situated on the middle shelf (proximal); F8, F9, F10 and F11 euphotic zone and inner shelf (open marine), F12 euphotic zone and inner shelf (slightly restricted). The Pir-Sabz coral fauna has a clear Mediterranean affinity and is represented by at least six different scleractinian species which formed a non-reefal coral community on the proximal middle-shelf.