This research is focused on a poorly studied Jurassic sequence in the eastern part of Alborz and Western Koppeh Dagh basins. The foraminifera are reported from Callovian (Middle Jurassic) to Tithonian (Upper Jurassic) sediments of the Farsian and Chaman Bid formations. The benthic foraminiferal associations belong to the families Ammodiscidae, Epistominidae, Hauerinidae, Hormosinidae, Ichthyolariidae, Lagenidae, Nodosariidae, Nubeculariidae, Ophthalmidiidae, Polymorphinidae, Rhabdamminidae, Saccamminidae, Spirillinidae, Spirocyclinidae, Textulariidae, Trocholinidae, and Vaginulinidae. In the studied area, the foraminifera are dominated by the families Nodosariidae, Vaginulinidae and Epistominidae. Palaeoecological analysis of the foraminiferal assemblages from the Farsian Formation indicates that these sediments were deposited on the inner to mid shelf environment, with normal salinity (euhaline), and relatively well oxygenated waters, with eutrophic conditions in the Goznawwi area and oligotrophic conditions in the Chaman Bid area. The foraminiferal assemblages in this study are the first record from Jurassic sediments of the eastern part of the Alborz and Koppeh Dagh basins in northern Iran.

这项研究的重点是在Alborz东部和Koppeh Dagh盆地西部的侏罗纪层系研究不足。据报道，有孔虫从Farsian和Chaman Bid地层的Callovian（侏罗纪中部）到Tithonian（侏罗纪上层）沉积物中。底栖有孔虫协会属于以下科：线虫科，表皮虫科，Hauerinidae，Hormosinidae，Ichthyolariidae，Lagenidae，Nodosariidae，Nubeculariidae，Ophthalmidiidae，Polymorphinidae，Rhabdamminidae，Saccamminidae，Spirillininee，Spirillininee，Spirillinineae，Spirillinine.e 在研究区域中，有孔虫科主要由野菜科，夜蛾科和Epi科组成。古波斯组有孔虫组合的古生态分析表明，这些沉积物沉积在内陆至中陆架环境中，具有正常盐度（真盐）和含氧量相对较高的水，Goznawwi地区为富营养化条件，而Chaman为贫营养条件竞标区域。这项研究中的有孔虫组合是伊朗北部Alborz和Koppeh Dagh盆地东部侏罗纪沉积物中的第一笔记录。