1. Rock shelterA rock shelter (also known as a rockhouse, crepuscular cave, or abri) is a shallow cave-like opening at the base of a bluff or cliff. Rock shelters form because a rock stratum such as sandstone that is resistant to erosion and weathering has formed a cliff or bluff, but a softer stratum, more subject to erosion and weathering, lies just below the resistant stratum, and thus undercuts the cliff. Many rock shelters are found under waterfalls. Rock shelters are often important archaeologically.
Read “Rock shelter” on English Wikipedia
Read “岩陰遺跡” on Japanese Wikipedia
Read “Rock shelter” on DBpedia
Read “Rock shelter” on English Wikipedia
Read “岩陰遺跡” on Japanese Wikipedia
Read “Rock shelter” on DBpedia
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