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Honeycomb Weathering

Mechanical or Physical Weathering Gallery

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Sandstone at San Francisco's Baker Beach has many closely spaced, small alveoli (cavernous weathering pits) due to the action of salt crystallization.
Small, close-knit tafoni

From stop 32 of the California Subduction Transect

Photo (c) 2005 Andrew Alden, licensed to About.com (fair use policy)
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