Global Volcanism Program | Image GVP-04402
Sharp-peaked Cotacachi stratovolcano rises above the caldera lake of Cuicocha volcano. The northern caldera wall truncates the flank of the heavily eroded Cotacachi. The caldera was formed during powerful explosive eruptions about 3100 years ago that produced 4.8 cu km of pumice-rich pyroclastic flows and airfall tephra that blanket the surrounding countryside.
Photo by Tom Pierson, 1992 (U.S. Geological Survey).