Calcarenite is a type of limestone that is composed predominantly (more than 50%) 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 some combination of these. Calcarenite is the carbonate equivalent of a sandstone. The term calcarenite was originally proposed in 1903 by Grabau as a part of his calcilutite, calcarenite and calcirudite carbonate classification system based upon the size of the detrital grains composing a limestone. Calcarenites can accumulate in a wide variety of marine and non-marine environments. They can consist of grains of carbonate that have accumulated either as coastal sand dunes (eolianites), beaches, offshore bars and shoals, turbidites, or other depositional settings.
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👉 Calcarenite in the context of Ilocos Norte
Ilocos Norte (English: Northern Ilocos/North of Ilocos), officially the Province of Ilocos Norte (Ilocano: Probinsia ti Ilocos Norte; Tagalog: Lalawigan ng Ilocos Norte), is a province of the Philippines located in the Ilocos Region. It is located in the northwest corner of Luzon island, bordering Cagayan and Apayao to the east, and Abra to the southeast, and Ilocos Sur to the southwest. Ilocos Norte faces the South China Sea to the west and the Luzon Strait to the north. Its capital is Laoag, which is the most populous settlement in the province.
Ilocos Norte is noted for its distinctive geography and culture. This includes numerous examples of well-preserved Spanish colonial era architecture, particularly Saint William's Cathedral in Laoag with its sinking bell tower constructed in the Earthquake Baroque style, the St. Augustine Church in Paoay which is one of UNESCO's World Heritage Sites in the Philippines, and the Cape Bojeador Lighthouse. Famous geographical features include the La Paz Sand Dunes, the beaches of Pagudpud, and the eroded calcarenite Kapurpurawan rock formation in Burgos.