Tafoni (singular: tafone) are small cave-like features found in granular rock such as sandstone, with rounded entrances and smooth concave walls. They often occur in groups that can riddle a hillside, cliff, or other rock formation.
They also frequently occur in granitic rocks. Small versions of tafoni are sometimes called alveoli; like the former, they are hypothesized to be results of salt weathering.
The Daily Omnivore 
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