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Pothole (landform)
Potholes, also known as caldrons, cisterns, ephemeral pools, tanks, tinajas, waterpockets, and weathering pits, are holes that were eroded away in bedrock.〔Hughes, Kebbi A., "Bacterial Communities and their Influence on the Formation and Development of Potholes in Sandstone Surfaces of the Semi-Arid Colorado Plateau" (2012). University of Western Ontario - Electronic Thesis and Dissertation Repository. Paper 543.
http://ir.lib.uwo.ca/etd/543〕 They are most commonly found in desert environments such as the Colorado Plateau. A few well known potholes are found in Canyonlands National Park, Capitol Reef National Park, and Moab. The Prairie Pothole Region is an area of the northern Great Plains that contains thousands of shallow wetlands known as potholes.
==Description==
Potholes form on flat surfaces causing them to not have any active draining, for instance there are no streams draining the potholes.〔Davis, Jim. "What are “Potholes” and how are organisms able to live in them?." Utah Geological Survey. N.p., n.d. Web. 9 Oct 2013. .
〕 They normally form on sandstone surfaces, but can be found on other rock types such as granite and limestone.〔 These rock types contain siliceous minerals. Potholes are capable of collecting water when it rains, freezing over when the weather gets cold, dry out in hotter weather, and can even contain some species of bacteria. Potholes range in size from a few centimeters to many meters in diameter. The cavities can be shallow or more than 15 meters deep, containing hundreds of liters of water.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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