Figure 10: Geological map of the Yakacık region showing the stratigraphical/structural units and locations of the samples collected in this study. Key: a. The Dikmen Graywacke consisting of Middle Triassic metaclastics belonging to the basement of Sakarya Continent, b. The Early Jurassic Bayırköy Formation (clastics and limestones of rosso ammonitico facies) overlying the basement of the Sakarya Continent (the Dikmen Graywacke), c. Ankara Ophiolitic Mélange with dismembered oceanic suit belonging to the Izmir-Ankara Ocean, d. The Coniacian Elmadağ Olistostrome with platform and pelagic carbonate blocks, e. The Neogene deposits, f. The Quaternary deposits, g. Location of the Acısu section, h. Main roads, i. Drainage system, j. Radiolaria occurrence in spot samples from blocks in the Elmadağ Olistostrome (redrawn, mainly revised after Duru & Aksay, 2002; Okay & Altıner, 2017; Okay et al., 2019). The red arrow indicates the direction of the photograph in Fig. 25.a.