Middle Jurassic to Early Cretaceous Calcareous Nannofossils from Onshore North Kuwait: A New Record

A new record of calcareous nannofossil datum markers from Middle Jurassic to Early Cretaceous (Aalenian to Valanginian) strata of onshore North Kuwait has been calibrated with nannofossil marker species of the global Jurassic to Early Cretaceous nannofossil biostratigraphy schemes and compared with calcareous nannoplankton assemblages recorded from Lower to Middle Cretaceous strata offshore Kuwait. The studied sections embrace, in ascending order, the Dhruma, Sargelu, Najmah, Gotnia, Hith, Makhul, Minagish and Ratawi formations and comprise argillaceous limestones, grainstones, packstones, bituminous packstones, wackestones, dolomite, anhydrite, laminated bituminous calcareous mudstone and calcareous shales all representative of a variety of environments from marginal marine (sabkha) and shallow hypersaline (salina) to fully marine mid to outer shelf settings.