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A cenote (English: / s ɪ ˈ n oʊ t i / or / s ɛ ˈ n oʊ t eɪ /; Latin American Spanish:) is a natural pit, or sinkhole, resulting when a collapse of limestone bedrock exposes groundwater. The term originated on the Yucatán Peninsula of Mexico, where the ancient Maya commonly used cenotes for water supplies, and occasionally for ...
Karst topography is a geological formation shaped by the dissolution of a layer or layers of soluble bedrock, usually carbonate rock such as limestone or dolomite, but also in gypsum. [1] It has also been documented for weathering -resistant rocks, such as quartzite , given the right conditions. [ 2 ]
The Sacred Cenote at Chichen Itza. The Sacred Cenote (Spanish: cenote sagrado, Latin American Spanish: [ˌsenote saˈɣɾaðo], "sacred well"; alternatively known as the "Well of Sacrifice") is a water-filled sinkhole in limestone at the pre-Columbian Maya archaeological site of Chichen Itza, in the northern Yucatán Peninsula.
They are also known as Yapese stone money or similar names. The typical rai stone is carved out of crystalline limestone and shaped like a disk with a hole in the center. The smallest may be 3.5 centimetres (1.4 in) in diameter.
The Raglan, Aotea, and Kawhia Harbours are worth a visit, especially the dissected hill country around Raglan formed on greywacke basement rocks, the limestone countryside, the sand dunes and beach near Kawhia, and Albatross Point west of Kawhia Harbour. Karioi and Pirongia volcanoes are well worth climbing, for those with sufficient fitness.
Limestone, dolomite, chalk and marl formed during Turonian and Santonian times, chalk and chert during the Campanian. The Mishash Formation of the same age contains similar rocks, 86 meters thick, as well as phosphorite. The Hatrurim Formation, or "Mottled Zone," encompasses metamorphosed Maastrichtian through Miocene rocks.
Montezuma Well (Yavapai: ʼHakthkyayva), a detached unit of Montezuma Castle National Monument, [1] is a natural limestone sinkhole near the town of Lake Montezuma, Arizona, through which some 1,500,000 US gallons (5,700,000 L; 1,200,000 imp gal) of water emerge each day from an underground spring. It is located about 11 miles (18 km) northeast ...
Tufa columns at Mono Lake, California. Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine or thermogene travertine.