Fig. 1. Geologic map of the Isabella pluton, showing location of hornblende (HB) diorite and gabbro wall rock (Kernville pluton) and the Kernville metasedimentary series: see text. Modified after Miller (1931) and Miller and Webb (1940), keeping their generalized map pattern but emphasizing locations of different rock facies. The Proto-Kern Canyon-Sierra Crest fault zone extends northward in the Kern River valley west of the small diorite and gabbro pluton.