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ophis: quarried rhyolite boulder
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ophis: rounded granitic xenolith in rhyolite
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ophis: rhyolite agglomerate boulder with included cobble of greenish epidotized andesite
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ophis: geologist Les Tyrala at outcrops at W base Gun Rock
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ophis: fine-grained epidotized andesite
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ophis: pillow lava?
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ophis: beach cobbles at W base Gun Rock
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ophis: dark andesite cobble
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ophis: Cape Ann basalt
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ophis: epidotized andesite cobble
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ophis: epidotized andesite cobble
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ophis: dark red cobble and epidotized andesite
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ophis: dark red cobble with large plagioclase crystals
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ophis: detail of dark red cobble