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Boset-Bericha
"Boset (Boseti-Gudda) and Bericha (Boseti-Bericcia) are composite dominantly rhyolitic-to-trachytic volcanoes rising 1000 m and 800 m, respectively, above the floor of the Ethiopian Rift valley. Initial basaltic-to-trachytic activity at Boset (also known as Gudda) was followed by rhyolitic effusive and explosive eruptions that resulted in caldera formation. A remnant of the caldera rim is found on the NW flank of Boset. Elsewhere post-caldera activity has produced very recent pantelleritic obsidian fissure-fed lava domes and flows that have buried the caldera wall, and flank eruptions from fissures parallel to the rift have produced voluminous pantelleritic lava flows. Bericha (also known as Bariccia) has produced similar very recent obsidian flows and associated pumice flows. Fissures connecting Boset and Bericha have erupted youthful, prehistorical basaltic lava flows."  -Smithsonian Volcano Archive
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