The Sebeș Formation is a geological formation in Romania. It is of Maastrichtian age. It is laterally equivalent to the . The base of the formation consists of claystones interbedded with sandstones and conglomerates.[1] It is well known for its fossils which form a component of the Hațeg Island fauna.
^Vremir, Mátyás; Bălc, Ramona; Csiki-Sava, Zoltán; Brusatte, Stephen L.; Dyke, Gareth; Naish, Darren; Norell, Mark A. (May 2014). "Petreşti-Arini – An important but ephemeral Upper Cretaceous continental vertebrate site in the southwestern Transylvanian Basin, Romania". Cretaceous Research. 49: 13–38. doi:10.1016/j.cretres.2014.02.002.