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compact clay containing many well preserved fossils. This clay is of a bluish cast and contains many fragments of Polyzoons in a fossil slate.
The island is evidently a remnant of a former extension of the mainland. The breakwater which connects it with the mainland is made of a sort of porphyrite from Catalina Island.
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San Pedro Bluffs. 
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These are on the opposite side of the harbor from the breakwater and consist of high bluffs mostly of unconsolidated sand which at their upper part carry a thick & prolific bed of Pleistocene fossils including many interesting species