The Upper Palaeozoic strata widely crop out in the Marselan Valley, 28 km northeast of Loshan, north of Sangrud. The litho- and biostratigraphic study led to identification of 57 species (distributed among 37 genera) of foraminifera and 8 genera and species of algae. Three lithologic units (formations), seven lithozones and three assemblage zones are identified within the study interval. The rock units of the Permian system are in descending order as: a) Doroud Formation (Asselian- Sakmarian, thickness of 225 m), underlain disconformably by the middle Carboniferous (Bashkirian- Moskovian) Khashachal Formation, consists of red conglomerate, sandstone, shale, siltstone and buff oncoid limestone that can be divided in to three lithozones. b) Ruteh Formation (Murghabian, thickness of 364 m) mainly composed of cliff forming limestone that can be divided into two lithozones, unconformably overlying the Doroud Formation. c) Nessen Formation (early Djulfian, thickness of 140 m) consists of marly limestone intercalated with shale (contains of two lithozones), unconformably underlain by the Ruteh Formation and overlain disconformably by Elika Formation of Early-Middle Triassic age. Thin beds of laterite-bauxite indicate an unconformity at the Permian-Triassic boundary. Also these beds reveal that the study area, with a humid warm temperature, was lying near lat. 30°S.

Qeshm is the biggest Iranian island in the Persian Gulf which is separated from Iranian coastline by the Clarence strait. Northwestern part of island consists of Mangrove forests in form of coastal marsh and marly sediments with grooved tidal channels. Twenty seven genera and fifty four species of benthic foraminifera were determined in the sediments of this region. It is important to note that foraminifera with coiled tests are abundant in the region mangrove forest muddy and clayly beds. Further offshore, uniserial, biserial or triserial tests exists with more abundancy and diversity .On the basis of sediment logical studies northern coasts beds, particularly in the northwestern part is muddy and clayey which is appropriate for abundancy and diversity of foraminifera with hyaline tests.

In this study, the sediments of Qom Formation was investigated in one stratigraphical section in west of Saveh (Kohlu Paein Section). The thickness of Qom Formation in Kohlu Paein Section measured 500 m. and it mainly consists of shale, marl, sandstone, sandy limestone and limestone.  In this section, the sediments of Qom Formation disconformably lie between Lower Red Formation at the base, and Upper Red Formation at the top. The study of 102 samples taken from the studied section led to the identification of 26 genera and 29 species of benthonic foraminifera , 2 genera and 3 species of planktonic foraminifera, 2 genera and species of red algae and 2 genera and  species of bryozoa . Among them, benthonic foraminifer has more variety and abundance. So, the benthonic foraminifera of the measured section were used to recognize the age of succession and justify their correlation. Based on the recognized foraminifera such as Borealis melo curdica, Dendritina rangi, Peneroplis evolutus, Meandropsina iranica, the Kohlu Paein section is comparable to biozonation introducted by Adams & Bourgeois (1967). It is analogous to Borelis melo group – Meandropsina iranica Assemblage Zone (1). According to distribution of the index foraminifera, the age of the sediments in Kohlu Paein section is Burdigalian.

In order to determine changes across the K/T boundary and to detect for aminiferal biozones a well preserved section of the Gurpi Formation in north of Kabirkuh, southwest of Iran was investigated. Maastrichtian biozones of Caron (1985) were all recorded. Moreover, Li & Keller's (1988a) CF 1 to CF4 zones were also recorded. Paleocene layers were divided into two biozones; Parasubbonna pseudobulloides and Parvularugoglobigerina eugu-bina zones based on Toumarkine & Lutherbakher (1985). As the index species for uppermost Maas-trichtian and lower Danian biozones were recorded the sedimentation across the KTB seems to be continuous though research to locate zone PO is still continued. Statistical studies of foraminifera show that 2/3 of the species extinct below and at the KTB and 1/3 remain in the lower Danian. The extinct fauna are of large size and omamented while the survivors are of small size and without omament-ation and cosmopolitan. This indicates that the extinction model was similar to that of type section.