The present study deals with depositional environment and microfacies analysis of the Asmari Formation in the Nasr–Abad section of Zagros basin in SW of Iran. The thickness of 240 m with Nasr–Abad stratigraphic section to define microfauna is taken from Asmari Formation. Asmari Formation is located in SE of Shiraz. According to the identified index microfossils, following three Oligocene assemblages are determined: 1: Nummulites fichteli–Nummulites vascus, 2: Archaias asmaricuas–Archiaias hensoni, and 3: Peneroplis evolutus–Austroterillina howchini. According to the field observation, thin section studies and the results of petrographic analyses, four microfacies contain open marine (MF1-3), shoal (MF-4), lagoon (MF5-7) and tidal flat (MF8-9) depositional environments are identified. Based on the paleoenvironmental interpretations, the lack of barrier reefs as well as of gradual facies change, a homoclinal ramp mainly represented by its inner and middle sectors is proposed and reconstructed for depositional environment of the Asmari Formation in the studied section.

中文翻译：

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法尔斯内部（伊朗扎格罗斯盆地）渐新世-中新世 Asmari 组的相分析和沉积环境

本研究涉及伊朗西南部 Zagros 盆地 Nasr-Abad 段 Asmari 组的沉积环境和微相分析。240 m 厚的 Nasr-Abad 地层剖面用于定义微型动物区系，取自 Asmari 组。Asmari Formation 位于设拉子东南部。根据已鉴定的微化石指标，确定了以下三个渐新世组合：1：Nummulites fichteli-Nummulites vascus，2：Archias asmaricuas-Archias hensoni，3：Peneroplis evolutus-Austroterillina howchini。根据野外观察、薄片研究和岩相分析结果，4个微相包含开阔海相（MF1-3）、浅滩（MF-4）、泻湖（MF5-7）和潮滩（MF8-9）沉积环境被识别。根据古环境解释，