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Roman Eye: Interpretive Center, Main Entrance, Sibley Volcanic Regional Preserve
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Roman Eye: Interpretive Center, Sibley Volcanic Regional Preserve
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Roman Eye: "Sibley's Geological Treasures" Interpretive Center, Main Entrance, Sibley Volcanic Regional Preserve
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Roman Eye: View of Mount Diablo from Round Top
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Roman Eye: View North from Round Top (1763 ft.)
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Roman Eye: Quarry View Showing Basalt on the Left and Orinda Mudstones on the Right
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Roman Eye: The "Wall" of Massive Basalt Lava
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Roman Eye: Looking Way Down into Another Quarry Pit
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Roman Eye: A Thick Accumulation of Cemented Red-baked Volcanic Cinders
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Roman Eye: A Beautiful Basalt Lava Flow