Tafoni

Cavities in the rock of a bluff near the Missouri River stare out at the observer, somewhat resembling the gaping mouths of goblins. Called "tafoni" by geomorphologists, these cavities are found in rocks across the globe, created by multiple erosional forces. Here in this Eagle Sandstone, wind and freeze-thaw of water are probably the primary forces behind this striking display of tafoni. Other mechanisms, including construction by lilliputians, are discussed here

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