 Later volcanic activity resulted in lava flows of dacitic composition being erupted along the ring fault of the caldera, as well as the formation of the resurgent dome by about uplift along the eastern caldera margin fault.This uplift encompasses both Galán ignimbrite rocks but also parts of the basement, the latter especially in the southern part of the dome.Post-caldera volcanism occurred on the northern margin of the caldera 2.01 ± 0.28 million years ago, and several small ignimbrites were emplaced after the main Galán eruption until less than 2 million years ago.