Abstract: In the tectonical evolution of the Hoyran Lake region, stable, tensional and compressional phaseshave followed each other recurringly. Main tectonical phases can be summarized as follows : (1) During the intervalof Liassic - Maestrichtian, a long stable phase and the development of Hoyran carbonate platform; (2) During the interval of Maestrichtian to Lutetian, tensional tectonism phase of gradually increasing intensity: During this phase,carbonate platform starts to be fragmented; (3) At the end of Upper Lutetian, compressional tectonics become dominant, and as a result of this, Internal Taurus ophiolitic melange nappe is emplaced on Hoyran carbonate platform.The period including the geologic events occurred up to here, and structures caused by these events has been called asPaleotectonic period; (4) Uplifting, local emergence, erosion, formation of molasse as a result of compressional tectonism, and dominant tensional tectonism; (5) A second compressional tectonism phase of lesser intensity at the endof Middle Oligocene: During this phase, by thrusting, the carbonate platform acts as a para - autochthonous unitwhile the molasse takes a new autochthonous position, and the region becomes complately terrestrial. In addition tothis, the regime of compressional tectonism begins changing to a character of tensional tectonism. The period betweenthe Paleotectonic period, which ceased at the end of Upper Lutetian, and the end of Middle Oligocene, during whichthe region becomes entirly terrestrial, has also been called as Transition period; (6) Tensional tectonism period,which has been dominating from the end of Middle Oligocene to present : During this period named as Neotectonicperiod, regional swelling, block - faulting, alkaline volcanism take place and the region acquires its present appearence.