The study of continental Neogene deposits in Damascus and Kalamoun areas has led to distinguish two lithological formations: the bottom one is composed of debris with fine elements in general, dominated by sand and clay, widespread on its base locally remnants of volcanic basalt flow. The top formation consist of conglomerate sediments with coarse elements of mixed sizes and sources. The study showed that volcanic flow which came from the south as basaltic flow from Al-Manea Mountain to the south of Damascus, reached the southern part of Dimas Basin and not far beyond it towards the north. Also, the study demonstrated that the age of the continental deposits overlying the volcanic flows belong at their bases to Lower Miocene age, in comparison with the data of the isotopic analysis of the volcanic rocks previously recorded in the region.