Microfacies features of upper jurassic-lower cretaceous inalti formation, Boyabat (Sinop) area

Upper Jurasic-Lower Cretaceous Inaltı Formation crops out widely in Boyabat (Sinop) area (Middle Pontides, N Turkey). Inaltı Formation consists of platform carbonates. This formation has laterally and vertically different lithofacies features. Inaltı Formation was deposited on tidal and reef areas. In order to determine the lithofacies features of this formation, a detailed stratigraphic section was measured at Akkaya Hill. In study area, the platform carbonates is medium-thick bedded and grey-beige coloured. General fauna community cosists of benthic foraminifera, algea, coral, mollusc, brachiapoda, gastropoda, echinoid plate and spurs. The most abundant types of fauna are benthic foraminiferas (Anchispirocyclina sp., Alveosepta sp., Everticyclammina sp., Rectocyclammina chouberti sp., Mohlerina basiliensis sp., Trocholina sp., Mesoendothyra sp., Miliolidae sp., Valvulina sp.) and algeas (sifonlu yeşil algler, Rivularia sp., Actinoporella sp., Thaumatoporella sp.). These fossils are very important because they demonstrate age of the formation and development of lithofacies. According to the carbonate components and textural features of the platform carbonates: Alveosepta oncoid packestone-floatstone lithofacies, Thaumatoporella ooilitic packestone-grainstone lithofacies, Trocholina wackestone-floatstone lithofacies, oolitic grainstone-rudstone lithofacies.