The BT. balirang forms two semi-circular craterwalls, whereas the sekincau is a younger eruption-point. the sekincau does not possess an actual cone - shape; it is rather an irregular dome, concicting of andesitic material.
thi sheet includes the topographic mapsheets 1:100.000 no. XVII, XVIII, XXIV, and XXV. previous data are given by verbeek (lit.8), ERB (3), Moerman (5) and Philippy (6,7)