time scale

boundary

depositional age

calcareous nannofossil

la formacion

late jurassic

sequence stratigraphy

south china

lower jurassic

foraminiferal biostratigraphy

Carnets de géologie/Carnets de géologie

The stratigraphic framework of the Upper Jurassic and Lower Cretaceous strata of Lebanon that dates back to Dubertret's publications required either consolidation or full revision. The preliminary results of our investigations in the Mount Lebanon region are presented here. We provide new micropaleontological and sedimentological information on the Salima Oolitic Limestones, which is probably an unconformity-bounded unit (possibly Early Valanginian in age), and the "Grès du Liban" (Barremian in age). Our revised bio- and holostratigraphic interpretations and the new age assignations lead us to emphasize the importance of the two hiatuses in the sedimentary record below and above the Salima, i.e., at the transition from the Jurassic to the Cretaceous.

Some steps toward a new story for the Jurassic - Cretaceous transition in Mount Lebanon