Characterization of Cenomanian Turonian boundary by using the unitary associations of Foraminifera in the costal chain /Syria

Abstract

The method of unitary association was used in this study to characterize the boundary of Cenomanian Turonian in six section at the long of costal chain in the west of Syria. The analyses of the planktonic and benthic foraminifera gives fives unitary associations to date the Cenomanian Turonian boundary interval in the studied sections. The fifth zone is considered the most proactive as it is definitely identified in five sections and spontaneous identified in one section, so it was considered the better zone. The number of unitary associations different from two zones in Bmouskous and cement factory sections to three zones in Aljamiley, Geneen and Dyr mama sectios. Fives zones were identified in Eskebleh section. This difference in the number of unitary associations in the sections is related to the absence of paleontological complex that identifies these zones interpreted to the sedimentary lacuna in studied section excepted Eskebleh section that presents continuous sedimentation. The biostratigraphic correlation between the unitary associations and

the classical zones in Bmouskous and cement factory sections indicate that the Cenomanian Turonian boundary correspond the lower part of fifth zone in the sections except Bmouskous section in that this boundary correspond the middle part of fifth zone.