 Around the caldera lie 40 lava domes, which extend northwest-southeast. There is an eastern group between Monte Pissis and Cerro Bonete Chico and a western one on the Sierra de Veladero. Overall, the domes have heights of 100 – 600 metres (330 – 1,970 ft) and a basal apron of about 1 kilometre (0.62 mi) width of erosional material. Some domes have water-filled craters with widths of 20 metres (66 ft) at their top. Domes on the caldera's northern side are dacitic and show signs of alteration. Some domes are probably part of the pre-caldera complex, and several rhyodacitic domes were modified by erosional processes after caldera formation; these were formerly considered erosional remnants. Older domes have reddish oxidized colours in satellite images. The total volume of the domes is about 16 cubic kilometres (3.8 cu mi).
