TURONIAN CALCAREOUS DEPOSITIONAL-ENVIRONMENTS IN THE DIEULEFIT AREA (VOCONTIAN BASIN, FRANCE)

Turonian series in the Dieulefit area were studied both sedimentologic ally and micropaleontologically. The calcareous Turonian formations re present the transition from an open shelf, through a storm-dominated s horeface into a foreshore sequence of limestones, with a great develop ment of quasi-planar laminated beds. Sigmoidal dunes are interbedded w ith the previous structures. The qualitative and quantitative evolutio n of benthonic and planktonic foraminifera population parameters provi des precise details about paleoenvironmental conditions. Facies and mi crofacies data permit us to propose a general deposit facies zonation from foreshore to offshore.