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sdttds: Small sampling
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sdttds: Agate Beach (Bolinas, CA.)
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sdttds: Bits o' tafoni-like patterned weathering
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sdttds: Jasper & chert
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sdttds: large black agate (dry)
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sdttds: large black agate (wet)
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sdttds: Oil agates 1
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sdttds: Oil agates 2
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sdttds: Petrified 1
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sdttds: Petrified whale bone 2
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sdttds: Petrified whale bone
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sdttds: Petrified wood?
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sdttds: Sandstone & silicified mudstone
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sdttds: Clam "tafoni"
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sdttds: IMG_6391_Petrified brain