The Fahliyan Formation, which is part of the Khami Group is one of the important oil resources in the lower cretaceous strata in the Zagros area. Index Foraminifera, continuity, and discontinuities have been used to identify the boundaries of this formation. To study biostratigraphy on Fahliyan Formation, the subsurface stratigraphic section of Aghar19 was selected in the southwest province of Iran. The thickness of this formation in this section is measured 215 m, including thin-to-medium-bedded limestone and dolomitic limestone. Fahliyan Formation continuously overlies Surmeh and Hith Formation and underlies Gadvan Formation. Vertical study of this formation has led to the identification of calcareous algae and foraminifera, which include 48 genera, 32 species, and three biozones in the sediments of the Fahliyan Formation. These biozones include: (1) Dukhania zone; (2) Pseudocyclammina lituus, Trocholina zone; and (3) Orbitolina, Choffatella, Salpingoporella Assemblage zone. Based on the established biozones, the age of the Fahliyan Formation in the Aghar19 section was determined from Berriasian to Early Barremian.

Khami集团的一部分Fahliyan组是Zagros地区下白垩统地层的重要石油资源之一。索引有孔虫，连续性和不连续性已被用来识别这种形成的边界。为了研究Fahliyan组的生物地层学，在伊朗西南部省选择了Aghar19的地下地层剖面。在此部分中，该地层的厚度为215 m，包括中薄层石灰岩和白云质石灰岩。Fahliyan组连续覆盖Surmeh和Hith组，并下盖Gadvan组。对这种构造的垂直研究已导致对钙质藻类和有孔虫的鉴定，包括法赫利扬组沉积物中的48个属，32种和3个生物区。这些生物区包括：杜卡尼亚区 （2）Pseudocyclammina lituus，Trocholina区; （3）Orbitolina，Choffatella，Salpingoporella组合区。根据已建立的生物区，确定了从亚伯利亚到早巴列米亚的阿格哈19段法赫里扬组的年龄。