Microfacies and sequence stratigraphy of the Asmari Formation at Tang-e Surkh section, southeast of Yasuj

The Asmari Formation in Tang-e Surkh section is composed of 294 meters of thin to medium bedded and thick to massive bedded limestone associated with marly limestone. The studied section is located in the northwest of Interior Fars. Based on deepening and shallowing patterns of microfacies، one HST and one third-order depositional sequence during Rupelian and two third-order depositional sequences during Chattian are recognized. Sequence boundaries are determined by bioclast imperforate foraminifera miliolid packstone، fine to medium grained hybrid sandstone، bioclast microconglomerate and calcareous conglomerate، respectively. The upper boundaries of sequences are defined as type 2، while the bounderies in sequences 3 and 4 are type I respectively.