Bio Stratigraphy and Trace fossils of Chehel-Kaman Formation in type section (east of Kopet-Dagh Basin)

Chehel-Kaman Formation is one of the Paleogene formations of Kopet-Dagh basin in east of Iran that conformably overlies and underlies the siliciclastic Pesteligh and Khangiran Formations, respectively. The lithology of it mainly consists of limestone and dolomite with interbeds of sand, shale and evaporate sediments. Two Paleosol in Unit 2 and 6 were identified and studied. Based on biostratigraphic studies, 33 genere and 32 species of Larger benthic foraminifera have been identified that according to recognition of Laffitteina, Miscellanea and Rotalid the age of Chehel-Kaman formation is Selandian to Ypresian (?). The Paleocene/Eocene boundary has been probably recorded as a thin red paleosol horizon (~10-15 cm). Identified Trace fossils are belonging to Skolithos and Cruziana ichnofacies that indicates this settings have been deposited in a carbonate Ramp system such as semi consolidated substrate to sublittoral carbonate zone.