The Lower Paleogene (7) Pugo Metavolcanics, consisting dominantly of greenschist facies
metamorphosed basaltic andesites and andesites, together with the Cretaceous-Paleogene (?) Dalupirip Schist, form the basement complex of the Baguio Mining District. Preliminary bulk chemical analyses of the Pugo Metavolcanics suggest generation in a transitional island arc - mid-ocean ridge environment. A marginal basin setting best fits the available geochemical data. Altogether, the Baguio Mining District has a complete lithologic package that preserves evidences charting the evolution of the area from a marginal basin to a mature island arc setting.