Writers : Safari, F.; Yazdi-Moghadam, M.; Sajjadi, F.
Refference : Scientific Quarterly Journal Geosciences, No. 77
Publishing Year : 1390

Abstract :

To recognize different species of the genus Orbitolina and determine the age of the Dariyan Formation, the upper limy part of the Dariyan Formation in Dashtak section was sampled and studied. Based on the size, shape and complexity of embryonic apparatus, five species belonging to subgenus Mesorbitolina were recognized as below: Orbitolina (Mesorbitolina) lotzei, Orbitolina (M.) parva, Orbitolina (M.) texana, Orbitolina (M.) subconcava, Orbitolina (M.) sp. cf .M. pervia According to stratigraphic distribution of the mesorbitolinids, the upper part of the Dariyan Formation can be ascribed to the late early Aptian-late Aptian. The early/late Aptian boundary coincides with first occurrence of O. (M.) parva

Subject List : Mesorbitolina