Upper andesitic lavas and volcaniclastic rocks of Nisyros (12,13)

They appear on the rim of the NE and SW part of the caldera, as well as on the N – NE and S slopes of the volcano. These constitute volcanic activity fed by basaltic andesitic and andesitic magma rich in gas. 

The products of the southern slopes are mainly lava flows (4 streams, each 0.3-3m. thick) and fallout lapilli of red and black scoriae (4 layers, each 1-3m. thick). 2 layers of dry surge deposits appear, 1-3m thick and minor layers of wet surge deposits that contain fossil olive tree leaves.

Their lowest members on the N – NE slopes are mainly lava flows. The upper members are hydrovolcanic deposits, mainly consisting of a light-gray tuff with the remarkable presence of dark glassy andesitic block, originating from abruptly quenched magma, 5-30cm in diameter.

The thickness of the series exceeds 40m at locations.

Several mud flows and debris flows are intercalated between the in-situ tuff ring pyroclastic deposits.

An apparent discontinuity appears between the Upper andesitic lavas and the underlying Kyra series; this is owed to a hiatus in volcanism for a significant period, resulting in the erosion of the pyroclastic rocks of Kyra before the superimposed formation was deposited.