The Bufumbira volcanic field in SW Uganda consists of a group of about 40 cinder cones over an area of about 320 km2 extending 20 km N of the large stratovolcanoes of the NE portion of the Virunga Mountains. The rocks are noted for their unusual ultrapotassic chemistry, including silica undersaturated and vesicular basalts (Barifaijo et al., 2010). The cinder cones occur in clusters, were erupted along lineaments, and are typically breached on one side by lava flows. Their age is not known precisely, but they are considered younger than the stratovolcanoes of the Virunga Range, some of which are Holocene in age.