Beginning at the granite-Eocene contact in the northeast part of the Ventura sedimentary basin, the cross section proceeds southeasterly through the Oak Canyon, Del Valle, Newhall-Potrero and Pico Canyon oil fields. From Pico Canyon the section is projected along a surface rock datum to Rice Canyon, then due south through the Aliso Canyon oil field. Rocks of Pleistocene through Eocene ages are discussed.

Purpose of the cross section is to illustrate the relationships between various time-stratigraphic and rock-stratigraphic units. Comments are made on the validity and accuracy of surface and subsurface formation names. Need for a new formation name for rocks lying between base of Pico formation and top of the Modelo formation is discussed.

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