This is a complex rhyolitic volcano overlying older basaltic flows. The rhyolites form a thick sequence of short flows towards the centre. No petrographical or chemical data have been traced but there may be alkaline rocks in the sequence.
VARET, J. 1978. Geology of Central and Southern Afar (Ethiopia and Djibouti Republic). Editions du Centre National de la Recherche Scientifique, Paris. (Explanation accompanying Geological map of central and southern Afar. 1:500,000).