Penon Blanco Volcanics
Penon Blanco Volcanics
Early Jurassic to Late Triassic
Andesite pillow breccia and flows, massive flows, minor tuff, and dark-green mafic rocks. Tuff, lapilli tuff and breccia constitute the upper part with lava and pillow lava forming the lower part. Both mafic and andesitic volcanics locally intensely deformed into a structural mélange. Intruded by the ~182-200 Ma Chinese Camp igneous complex (Gcc). The age of the intruding unit suggests that this unit is at least in part Late Triassic, which differs from the formally accepted age of Jurassic.