Nazan Yalc¸in Erik* 2018. Biological marker indicators of paleo-depositional environment for the Eocene formations around Zara-Bolucan region (central anatolia, Turkey). Advances in Geo-Energy Research. 2, 3 (Jun. 2018), 237–244. DOI:https://doi.org/10.46690/ager.v2i3.45.