The calcareous nannofossil record of the uppermost Maastrichtian-lower Palaeocene in the Kırıkkale Basin, in the Central Anatolian Region (Turkey)

The Late Cretaceous–Early Paleogene (K–Pg) was a critical period of transition in geological time. This encompassed short-term climatic fluctuations on global scale, changes ocean circulation, and sudden large extinctions marine terrestrial organisms. In the study area, located mid to low latitudes, Cretaceous Early were very tectonically active due positioning site close collision zone two continents. impacts K–Pg crisis can be observed area. this study, calcareous nannofossil contents late Maastrichtian–Danian sediments studied, biostratigraphy determined, from samples Samanlık Dizilitaşlar Formations, deposited Kırıkkale Basin. From three stratigraphic sections, 26 genera 36 species identified Maastrichtian UC20aTP UC20bTP biozones NP1 NP2 Danian. Additionally, it determined that boundary not continuous Basin, relatively abundances Micula decussate Vekshina, 1959 signals diagenetic effect stressful environment Maastrichtian, whereas Thoracosphaera operculata Bramlette & Martini, 1964, Braarudosphaera bigelowii (Gran Braarud, 1935) Deflandre, 1947 Futyania petalosa (Ellis Lohmann, 1973) Varol, 1989 Danian assemblages indicate unstable environmental conditions major perturbations reflect tectonic activity region. No nannofossils encountered those taken turbiditic levels, which contained high proportions sand.