Silurian graptolite, conodont and cryptospore biostratigraphy of the Gülüç section in Ereğli, Zonguldak Terrane, NW Anatolia, Turkey

The specific features of the Gülüç section (lithological changes, condensation, stratigraphic gap, change in graptolite diversity) are related to the global model of Silurian T–R cycles.