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fksr: Rocks along Conzelman Road in the Marin Headlands
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fksr: Layered Rocks in the Marin Headlands
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fksr: Polished Marin Headlands Pebbles
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fksr: Etched Piece of Radiolarian Chert
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fksr: Fossilized Radiolarians - 3
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fksr: Fossilized Radiolarians - 2
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fksr: Fossilized Radiolarians - 1