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Below is a summary of eruption dates and Volcanic Explosivity Indices (VEI).

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Beate B, 1992. . (pers. comm.)

Beate B, Salgado R, 2005. Geothermal country update for Ecuador, 2000-2005. {Proc World Geotherm Cong 2005, Antalya, Turkey, 24-29 April 2005}, 5 p

Cuellar-Rodriguez J V, Ramirez-Lopez C, 1987. Descripcion de los volcanes Colombianos. {Rev CIAF, Bogota}, p 189-222

Hall M L, 1992. . (pers. comm.)

Hantke G, Parodi I, 1966. Colombia, Ecuador and Peru. {Catalog of Active Volcanoes of the World and Solfatara Fields}, Rome: IAVCEI, 19: 1-73

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. {IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior}.

INECEL, 1987. Estudio de prefactibilidad del "Projecto Geotermico Binacional Tufino-Chiles-Cerro Negro". {Inf Geovulcanologico Realirado Aquater/BRGM/OLADE}, unpublished rpt

Cerro Negro de Mayasquer, astride the Colombia-Ecuador border, is a stratovolcano with a caldera open to the west. Andesitic and dacitic lava flows are of possible Holocene age (Hall 1992, pers. comm.). Solfataras are found on the shore of a small crater lake. An historical eruption reported in 1936 may have been from Reventador (Catalog of Active Volcanoes of the World). The higher, glacier-covered summit of the Pleistocene Chiles stratovolcano lies only 3 km to the SE. Chiles last erupted about 160,000 years ago, but has hot springs and an active hydrothermal system at its eastern flank.