Aliso volcan est un stratovolcan nouvellement découvert complexe au pied des Andes équatoriennes, est du volcan Antisana et au sud-ouest de la ville de Baeza oriental. Il contient des coulées de laves andésitiques, des dômes de lave et des dépôts de nuée ardente. Aliso volcan est en sommeil et a été actif dernier il y a environ 2000 ans.

from Smithsonian / GVP Aliso volcano information:

The largely unexplored complex contains a curved summit ridge on the west with older andesitic lava flows and tundra-like vegetation, and rhyolitic and dacitic lava domes in a wet cloud-forest environment on the lower eastern flanks.

The Pumayacu center on the SE flank contains several lava domes along a NNE axis parallel to the Andean Thrust Fault System (TFZ). Morphologically young andesitic lava flows occur along the flat-topped ridge above Baeza town. The Pumayacu center erupted pyroclastic-flow deposits of late Pleistocene and Holocene age. One pyroclastic-flow deposit was dated at about 4400 years Before Present, and a pumice lapilli layer overlies a ceramic-rich cultural horizon thought to be about 2000 years old