The Kajyamamuk volcano straddles the western margin of the rift and is obscured by rocks of the Oliyamur volcano (No. 085-00-021) to the west and basalts from Emuruangogolak (No. 085-00-022) and rift valley alluvium to the east. Basal trachyte lavas are overlain by mugearites and these in turn by pumice tuffs
KEY, R.M. 1987b. Geology of the Maralal area. Report, Geological Survey of Kenya, 105: 1-93.