 These include the lava dome and lava flow fields (760,000 ± 90,000 and 740,000 ± 50,000 years ago respectively) and a lava flow from the pyroclastic cones, which has been dated to 350,000 ± 30,000 years ago.Volcanic activity at Incahuasi may have continued into the Holocene, considering the young appearance of its eruption products such as lava flows in the summit region and on the southern slopes; the old ages obtained by radiometric dating indicate an extinct volcano although activity at Andean volcanoes is known to occur with long rest phases between eruptions (reaching one million years).There are reports of fumarolic activity.