Deposited on the quartz diorite along this part of the hike are sedimentary rocks of Cretaceous and Paleocene age, but they are not very well exposed. Deposited on top of the Paleocene rocks is a sandstone unit called the Lower Topanga Formation, which is exposed in a roadcut along Mulholland Drive just north of the Summit Overlook. In this photo of part of the exposure, a small fault cuts across and displaces the alternating beds of brown and white sandstone.
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