“…The last occurrence datum (LOD) of Acicularia sp., Bakalovella elitzae Bakalova, 1971, Clypeina gigantean Sokač, 1996 and Terquimella sp. have also been recorded in this boundary that confirms the end of the Barremian (Dragastan, 1999;Granier, 2001;Mancinelli and Chiocchini, 2006;Taherpour Khalil Abad, 2017). The Lower/Upper Aptian boundary is marcked by the FOD of Mesorbitolina parva Douglass, 1960 and LOD of Praeorbitolina cormyi Schroeder, 1964and Palorbitolina lenticularis Blumenbach, 1805(Schroeder et al, 2010 and recorded in the basal layers of the unit 5.…”