Abstract
Qom Formation (Oligo-Miocene marine deposits of Middle Iran) is deposited at the northeastern margin of the Tethyan Seaway. The Qom Formation in northern Abadeh (Sanandaj–Sirjan fore-arc basin) conformably overlies the Lower Red Formation (LRF). Foraminifera (including small and larger benthonic forms), coralline red algae, and corals are the dominating biogenic components of the Qom Formation; bivalves, echinoids, bryozoans, and gastropods are subordinate ones. Larger benthic foraminifera (mainly Lepidocyclinidae and Nummulitidae), biostratigraphically, are the main biota of the Qom Formation in the study area. Among the larger benthic foraminifera, the last true Nummulites spp. became extinct at the top of Late Rupelian and all of the in situ Nummulites bearing layers of the Qom Formation belong to Rupelian in age. The presence of Nummulites vascus allows the age of the lower parts of the formation to be determined as Rupelian. Based on biostratigraphy data and foraminiferal assemblages, the Qom Formation is Rupelian-Chattian, in age in northern Abadeh area.
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