The Odemis Formation crops out around Odemis village to the northwest of the town of Ilgaz (Cankiri, Turkey). The Formation was deposited in neritic environments, and it consists of conglomerate, nodular limestone, sandstone, sandy limestone, and claystone, interbedded with volcanics. The sandy limestones contain the benthic foraminifera Orbitoides aff. medius (d'Archiac), O. aff. apiculatus Schlumberger, Sirelina orduensis Meric & Inan, Omphalocyclus macroporus (Lamarck), Sirtina orbitoidiformis Bronnimann & Wirtz, Praestorrsella roestae (Visser), Laffitteina bibensis Marie, Laffitteina boluensis Dizer, Laffitteina aff. marsicana Farinacci, Smoutina aff. cruysi Drooger, Siderolites calcitrapoides Lamarck, and Selimina spinalis Inan. Praestorrsella roestae (Visser) was abundant. This foraminiferal assemblage indicates an upper Maastrichtian age.