Tafoni weathering in a basalt dike at Cape Perpetua State Park. This type of cavernous weathering does not seem to be well-understood, but I definitely associate it with salty environments. Here, the salt is from spray in the surf. In many other places I've seen it, it's associated with interior drainage, and the salt consequently concentrated in evaporative basins.
Photo unmodified. September 21, 2010. FlashEarth Location.
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