ABSTRACT: The caJc-alkaline and alkaline volcanism which occurs over large areas in Western Anatolia» Thrace and the Aegean islands have kept its activity through out Tertiary and Quaternary periods* The results of petrologies! studies of these occurrences are given in the article and a possible concept of origin for these rocks is also suggested. Although the Cenozoic volcanism is discussed in this work, the Upper-Cretaceous volcanism the Black Sea coast is also mentioned brieflefly because of its relationship with the younger volcaMsm in the region understudy. The general purpose of this work is to quite a number of studies on volcanic rocks which show different pétrographie properties and extruded in different geolofical times* It is also intended m this work to point out the relationship amongst these different types of volcanic rocks as much as possible