ABSTRACT : It is widely known liât» Upper Cretaceous .and. Paleocene aged sediments exposed in. the western, part of Poetic Belt were:, in general.,, developed, in a deep-marina environment. To the east,, specially during the Paleocene period, deposiiional conditions were gradually changed in to shallow-marine as has been mentioned by various authors. Although, a similar stioation should toe expected in the north of Göyraik (Bolu), an open (deep?)-marine conditions have been again observed for the Paleooene sequence.