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ophis: interbedded siltstones and sandstones dip to southeast
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ophis: exposure about 12 ft high
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ophis: layers hardly deformed
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ophis: differential erosion
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ophis: beds
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ophis: contact
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ophis: 580 million yrs is not forever
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ophis: overhang
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ophis: flat pebbles in swash zone
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ophis: Squaw Rock, Thompson's Island, and Boston