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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 ...
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.
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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.
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.
Calcarenite is a type of limestone that is composed predominantly, more than 50 percent, of detrital (transported) sand-size (0.0625 to 2 mm in diameter), carbonate grains. The grains consist of sand-size grains of either corals , shells , ooids , intraclasts , pellets , fragments of older limestones and dolomites , other carbonate grains, or ...
The CPG consists of siliciclastic and limestone, marine and non-marine sedimentary rocks, containing petrified wood and gastropods within chert. The Antigua Formation includes benthic foraminifers and molluscs, scleractinian corals, echinoids, crabs, bryozoans, crinoid columns and sponges. The limestone Devil's Bridge, is an example of this ...