Global Volcanism Program | Image GVP-04829
The solitary Holocene Cerro Overo maar, seen here from the south, was erupted through basement ignimbrites of Pliocene age, which form the light-colored rocks in the crater wall. A thin blanket of dark ejecta from the eruption that created the 600-m-wide, 80-m-deep maar caps its rim. Pleistocene volcanoes of the central Chilean Andes form the horizon.
Copyrighted photo by Katia and Maurice Krafft, 1983.