A New Age Finding In The Central Sakarya Region (NW Turkey)

The existence of a metamorphic basement cut by granitoids is known in the Central Sakarya region of northwest Turkey according to the previous studies. Over this metamorphic basement, there is a Liassic unit which contains ammonite, brachiopod and some benthic foraminifers and has a sequence starting with fluvial deposits at the base and grading into coastal, subtidal and shallow marine sediment character towards the top in the vicinity of Sarıcakaya district, Eskişehir City. At different levels of this unit which is called as the “Kapıkaya Formation”, the Campanian age fossils such as; Ceratolithoides aculeus(Stradner), Pervilithus varius Crux, Watznaueria barnesae (Black), Tortolithus sp., Biscutum sp. Quadrum sissinghii Perch-Nielsen, Watznaueria barnesea Black, Ellipsagelosphaera fosscincta were identified in this study. These fossil findings clearly reveal the presence of a Campanian aged unit in the region. This unit is composed of flyschoidal facies deposits and includes exotic limestone blocks of Liassic age and is overlain by Malm ? Early Cretaceous limestones at the same time. The overlying of Malm ? Early Cretaceous rocks to Campanian deposits is closely related to the tectonics that has been effective in the region during or post Campanian.