In this area is an extensive cluster of trachyte plugs with fewer of soda trachyte and a single one of phonolite.
DAVIDSON, A. 1983. The Omo River project. Reconnaissance geology and geochemistry of parts of Ilubabor, Kefa, Gemu Gofa and Sidamo, Ethiopia. Bulletin, Ethiopian Institute of Geological Surveys, 2: 1-89.