The 7 million year-old Chaxas ignimbrite massif has been related to the caldera-forming eruption at Sairecabur. These dacitic ignimbrites spread southwest towards the Salar de Atacama. This high age estimate for the Chaxas ignimbrite however has been questioned, considering that it is inconsistent with stratigraphic relationships of this ignimbrite to older ignimbrite. The lava formations are named Post-Caldera Lavas I and Post-Caldera Lavas II; the first is of Pleistocene and the second of Holocene age. A fresh flow that extends northwest from Sairecabur appears to be the most recent flow.