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Well No. 123 is one of the exploration wells located in the center of the subsurface anticline at the Marun Oil Field. Gurpi Formation has 208 meters thick in this well. The primary lithology of the Gurpi Formation includes shale and marl. One of the oldest stratigraphic and paleontological studies on the Gurpi Formation is (Wynd, 1965), which has introduced three biozones.

Other studies on the Gurpi Formation based on calcareous nannofossils in other parts of the Zagros sedimentary basin can be found (Hadavi and Shokri, 2009) in southern Ilam, with Early Campanian-Danian age,(Senemari and Bakhshandeh, 2013), with Late Santonian-Maastrichtian, Shahriyary et al.(2017) in the Samand anticline (Lorestan Province), with Middle Campanian to Late Paleocene (Celandiane) age. Also, by recording a discontinuity in the upper part of Danian, Fereydoonpour et al.(2018), in the Izeh region have introduced CC15 to CC25 biozones based on standard calcareous nannofossil zone of Sissingh (1977), that was proposed was identified the age of Late Coniasian to Late Maastrichtian.