Note 83 — Chapter IX
Reading edition
In Brigham's Notes on the Volcanic Phenomena of the Hawaiian Islands, this volcano is put down as active, but there has been no eruption in the memory of man. Its lithology is represented in our collection by porous, gray, granular trachyte, fine-grained, compact trachyte, and dark porphyroid trachyte. The derivation of Sincholagua is unknown, Rumiñagui means the face of a rock, Cotopaxi, Sincholagua, and Rumiñagui, and Cotopaxi, Pichincha, and Guamani, form equilateral triangles.