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Canton Island typifies the isolated coral atolls dotting the Pacific Ocean. The Structure and Distribution of Coral Reefs, Being the first part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836, was published in 1842 as Charles Darwin's first monograph, and set out his theory of the formation of coral reefs and atolls.
A coral reef is an underwater ecosystem characterized by reef-building corals.Reefs are formed of colonies of coral polyps held together by calcium carbonate. [1] Most coral reefs are built from stony corals, whose polyps cluster in groups.
The Tafraout Group (Also Tafraoute Group or Zaouiat Ahançal Group) is a geological group of formations of Toarcian-Aalenian (Lower Jurassic-Middle Jurassic) age in the Azilal, Béni-Mellal, Imilchil, Zaouiat Ahansal, Ouarzazate, Tinerhir, Tinejdad and Errachidia areas of the High Atlas (with the Tagoudite Fm reaching areas like Rich in the Middle Atlas) of Morocco.
An alternative model for the origin of atolls is called the antecedent karst model. In the antecedent karst model, the first step in the formation of an atoll is the development of a flat top, mound-like coral reef during the subsidence of an oceanic island of either volcanic or nonvolcanic origin below sea level.
Spur and groove formations are a geomorphic feature of many coral reefs. They are ridges of reef formed by coral ("spurs") separated by channels ("grooves") which often have sediment or rubble bed. Spur and groove formations vary in their size and distribution worldwide but are a common feature on many forereefs of fringing reefs , barrier ...
This coral reef has more biodiversity than in any of the waters of India. It is one of only a few pristine systems in Sri Lanka. Belize Barrier Reef: Belize: This is the second biggest coral reef system on Earth, the largest being the Great Barrier Reef.
The Global Coral Reef Monitoring Network (GCRMN) reported in 2021, that the East Asian Seas region, which includes the Coral Triangle, was the only region where coral cover was substantially greater in 2019 (36.8%) as compared to 1983 (32.8%), which is the year that the earliest data was collected.
Scarborough Shoal forms a triangle-shaped chain of reefs and rocks with a perimeter of 46 km (29 mi). It covers an area of 150 km 2 (58 sq mi), including an inner lagoon. The atolls' highest point, South Rock, is 1.8 m (5 ft 11 in) above sea level at high tide .