The edifice of the volcano is irregular and various estimates of its volume exist, ranging . The best estimate is considered to be . Palomo rises from an elevation of about , and it covers a surface area of . Beneath the volcano lie two calderas with diameters of and ; the summit has a double crater as well, which may reflect a northeastward migration of volcanic activity. northeast of Palomo lies the high Andrès subsidiary vent.: This vent features a wide crater that opens to the south. Andrés is constructed on a granitoid basement that slopes into the valley of Rio Cortaderal,: and its name relates to the son of Reynaldo Charrier, a geologist who described the subsidiary centre in 2010 and who hoped that his son would one day also know the mountain range.: