Figure 1: Geologic map of the Valles Caldera. The youngest eruptions occurred in the southwestern moat of the caldera. South Mountain Rhyolite (SMR) is the youngest rhyolite dome of the Valle Grande Member. El Cajete Series consist of three members: El Cajete Pumice Fall (ECP), Battleship Rock Tuff (BAT), and Banco Bonito Lava Flow (BB). Thickness of El Cajete Pumice is shown in the isopach map. L.A., Los Alamos; W.R., White Rock; S.F., Santa Fe; VR, undifferentiated Valle Grande Member rhyolite domes [10,16].