"Acamarachi, a steep-sided andesitic-dacitic volcano with slopes that reach about 45 degrees, forms the highest peak in this part of the northern Andes. Acamarachi, also known as Cerro Pili, is at the SSE end of a small volcanic complex that extends from the neighboring volcano Colachi to the NNW. A large lava dome is located on the north flank of the 6046-m-high volcano. A poorly preserved summit crater and the absence of youthful flank lava flows suggest that Acamarachi was largely constructed in pre-Holocene times, although the summit lava flows draping the upper cone were considered to be of Holocene age (González-Ferrán, 1995)."  -Smithsonian Volcano Archive
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