Mt. Meru, in northern Tanzania, is an active stratovolcano. Earlier studies suggested that the volcanic geology of Mt. Meru is dominated by debris-avalanche deposits (DAD), lava flows, and major pyroclastic formations indicative of Plinian-style eruptions. However, the stratigraphy, geochemistry, petrology, spatial extent, and chronology of these pyroclastic deposits had not been systematically documented, resulting in only limited knowledge of ...