Eleven marine palynomorph species including nine dinoflagellata cyst species belonging eight genera and two acritarch species belonging to one genus were recognized from Shemshak Formation at Ozon Mountain. According to their stratigraphic distribution, two biozones, Nannoceratopsis spiculata Biozone and Valensiella ovulum Biozone were erected. Based on the stratigraphic range of dinoflagellata cyst species an age of Toarcian-Early Bajocian is suggested for the upper part of the formation.
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