A 'rock shelter' is a shallow cave-like opening at the base of a bluff or
cliff. Another term is rockhouse.

Rock shelter
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.
This same phenomenon commonly occurs at
waterfalls, and, indeed, many rock shelters are found under waterfalls.
Rock shelters are often important
archeologically. Because rock shelters form natural shelters from the weather, prehistoric humans often used them as living-places, and left behind trash, tools, and other
artifacts. In mountainous areas the shelters can also be important for
mountaineers. In western
Connecticut and eastern
New York, many rock shelters are known by the
colloquialism "leatherman caves"
[1], as they were inhabited by the
Leatherman over three decades in the late
1800s.
See also
★
Mesa Verde
★
Walnut Canyon