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Figure 34. Northwestern segment of the Whittier fault from Whittier oil field to Turnbull oil field. Microfaunal divisions (Division E (E), Division D/Division E contact (D/E), Division D (D) and Division B/Division C contact (B/C)), Yorba Member (Tpy), Sycamore Canyon Member (Tpsc), Pliocene/Miocene contact (P/C), Lower Fernando Member (Tfl). Arrows along the wellbore identify locations of microfaunal data. Modified from Yerkes (1972, cross section C-C’) and Herzog (1998, cross section C-C’). Interpretation of hanging-wall block based on data from Daviess and Woodford (1949). The two volcanic or diabase units are each drilled by a single well (Los Angeles Brewing Jones Community 1 and Conoco Buehler 1). Woodford, et al. (1944) reported Luisian and Relizian foraminifera in the latter well. Since the 3-D shape of these igneous units is not known, the interpretation on the cross section is speculative.