The hike starts in the Conejo Volcanics, but soon after starting the trail passes across the Malibu Bowl fault and down into the Lower Topanga Formation. Exposures along the trail are poor, but if one hikes north along Kanan Dume Road for a quarter mile before joining the trail, the Malibu Bowl fault is visible in this roadcut. The fault passes diagonally across the photo from upper left to lower right, separating the upper brown volcanic rocks of the Conejo Volcanics, about 17,000,000 years old, from the underlying dark gray shale of the Lower Topanga Formation, about 20,000,000 years old.
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