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Tepuis : ウィキペディア英語版
Tepui

A tepui , or tepuy (), is a table-top mountain or mesa found in the Guiana Highlands of South America, especially in Venezuela and western Guyana. The word tepui means "house of the gods" in the native tongue of the Pemon, the indigenous people who inhabit the Gran Sabana.
Tepuis tend to be found as isolated entities rather than in connected ranges, which makes them the host of a unique array of endemic plant and animal species. Some of the most outstanding tepuis are Neblina, Autana, Auyantepui and Mount Roraima. They are typically composed of sheer blocks of Precambrian quartz arenite sandstone that rise abruptly from the jungle, giving rise to spectacular natural scenery. Auyantepui is the source of Angel Falls, the world's tallest waterfall.
== Morphology ==


These table-top mountains are the remains of a large sandstone plateau that once covered the granite basement complex between the north border of the Amazon Basin and the Orinoco, between the Atlantic coast and the Rio Negro. Throughout the course of the history of Earth, the plateau was eroded, and the tepuis were formed from the remaining monadnocks.

There are 115 such mesas in the Gran Sabana in the south-east of Venezuela on the border with Guyana and Brazil, where the highest concentration of tepuis is found. The precipitous mountains tower over the surrounding area by up to 1,000 meters.
Tepuis range in elevation from .

Because of their great age, some tepuis exhibit surface features and subsurface caves typical of karst topography, formed in more water-soluble rocks such as limestone. Caves here include the deep Abismo Guy Collet, the deepest quartzite cave in the World. Some of the mesas are pocked with giant sinkholes up to in diameter and with sheer walls up to deep. These sinkholes are formed when the roofs of tunnels carved by underground rivers collapse.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Tepui」の詳細全文を読む



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