Abstract: in this study, the sedimentological characteristics of lower Miocene (Burdigalian) aged Adilcevazlimestone that outcrops north of lake Van were determined by means offacies analysis. Using these data, anapproach to establish the Lower Miocene paleogeography of the study area was made.After field studies, laboratory studies were undertaken and the limestone was separated in 6 microfacieses. These are1. Wackestone-packstonefacies with redalgae andcoarse bentonic foraminifera2. Boundstone facies with red algae and Bryozoa3. Boundstone facies with red algae and coral4. Calciruditefacies with redalgae andcoarse bentonic foraminifera5. Wackestone-packstonefacieswith Globigerinoidae6. JVackestonefacies with red algae and Lepidocyclina sp.  These facieses were used in an approach to the paleogeographical evolution of Adilcevaz limestone. Observations infieldstudies andfindings infacies analysis indicate that theAdilcevaz limestone was deposited ina carbonate shelf which bears abundant red algae.