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A 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. Because rock shelters form natural shelters from the weather, prehistoric humans often used them as living-places, and left behind debris, tools, and other artifacts. In mountainous areas the shelters can also be important for mountaineers. Transhumant nomads, people who move with their livestock - often from lower permanent winter residences in the valleys to higher summer pastures - frequently build semi-permanent camps, often of rocks. In western Connecticut and eastern New York, many rock shelters are known by the colloquialism "leatherman caves",〔(CT Museum: Leatherman Caves )〕 as they were inhabited by the Leatherman over three decades in the late 19th century. In arid areas, wind erosion (eolian erosion) can be an important factor in rockhouse formation. In most humid areas, the most important factor in rockhouse formation is frost spalling, where the softer, more porous rock underneath is pushed off, tiny pieces at a time, by frost expansion from water frozen in the pores. Erosion from moving water is seldom a significant factor. Sandstone can be used as shingles for roof tops when possible. The Cumberland stitchwort (''Minuartia cumberlandensis'') is an endangered species of plant which is found only in rock shelters in Kentucky and Tennessee.〔(Center for Plant Conservation )〕 File:Rock shelter formation by frost weathering.svg|By frost weathering File:Rock shelter formation by karst gallery cutting.svg|By cutting a karst gallery File:Rock shelter formation by river erosion.svg|By river erosion ==See also== * Gatecliff Rockshelter * Kinlock Shelter * Mesa Verde * Overhang (architecture) * Roc-aux-Sorciers * Shelter Rock (North Hills, New York) * Walnut Canyon 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rock shelter」の詳細全文を読む スポンサード リンク
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