- Tepui
A Tepui (or Tepuy) (pronEng|ˈtɛpˌwi) is a table-top mountain (
mesa ) found only in the Guayana highlands ofSouth America , especially inVenezuela . The word tepui means "house of the gods" in the native tongue of thePemon , 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 areAutana ,Auyantepui and Mount Roraima (the highest and most famous one, on the border tripoint ofVenezuela ,Brazil andGuyana ). They are typically composed of sheer blocks ofPrecambrian sandstone orquartzite rocks rising abruptly from the jungle, giving rise to spectacular natural scenery.Auyantepui is the source ofAngel Falls , the world's tallestwaterfall .Morphology
These table-top mountains are the oldestClarifyme exposed rock formations on the planet, the remains of a large, sandstone plateau that once covered the granite basement complex between the north border of the
Amazon Basin and theOrinoco , between the Atlantic coast and the Rio Negro. Throughout the course of thehistory of Earth , the plateau was eroded, and the tepuis were formed from the remainingmonadnock s. There are 115 such mesas in the Gran Sabana in the south-east of Venezuela on the border withGuyana andBrazil , where the highest concentration of tepuis is found. The precipitousmountain s tower over the surrounding area by up to 1,000 meters. On the top of the mountains grow various types of forests with a wide variety oforchids and Bromeliads species. Because of their great ageClarifyme, some tepuis exhibit surface features and subsurfacecaves that are typical of more water-soluble rock such aslimestone . Caves here include the 671m deepAbismo Guy Collet , the deepest quartzite cave in the world. Some of the mesas are pocked with giantsinkhole s up to 300 metres in diameter and with sheer walls up to 300 metres deep. These sinkholes are formed when the roofs of tunnels carved by underground rivers collapse.Flora and Fauna
The plateau of the
mesa s is completely isolated from the ground forest, making themecological island s. The altitude causes them to have a different climate from the ground forest. The top presents cool temperatures with frequent rainfall, while the bases of the mountains have a tropical, warm and humid climate. The isolation has led to the presence of endemic flora and fauna through evolution over millennia of a different world of animal and plants, cut off from the rest of the world by the imposing rock walls. Some tepui sinkholes contain species that have evolved in these "islands within islands" that are unique to that sinkhole. The tepuis are often referred to as theGalápagos Islands of the mainland, having a large number of unique plants and animals not found anywhere else in the world. The floors of the mesas are poor in nutrients, which has led to a rich variety ofcarnivorous plants . The weathered, craggy nature of the rocky ground means no layers ofhumus are formed.The tepuis, also known as 'islands above the rainforest', are a challenge for researchers, as they are home to a high number of new species which have yet to be described.Fact|date=February 2007 A few of these mountains are cloaked by thick clouds almost the whole year round. Their surfaces could previously only be photographed by helicopter radar equipment. Humans have still yet to set foot on many of the tepuis.Fact|date=February 2007
Most tepuis are in the
Canaima National Park in Venezuela, which has been classified as aWorld Heritage Site by UNESCO.elected Tepuis
A few of the most notable of the 115 Tepuis:
*
Auyantepui is the largest of the tepuis with a surface area of 700 km².Angel Falls , the highest waterfall in the world, drops from a cleft in the summit.
*Mount Roraima, also known as Roraima Tepui. A report by the noted South American researcher Robert Schomburgk inspired the Scottish authorArthur Conan Doyle to write his novel "The Lost World" about the discovery of a living prehistoric world full of dinosaurs and primeval plants.
*Matawi Tepui, also known as Kukenan, because it it is the source of the Kukenan River, is considered the "place of the dead" by the localPemon Indians.
*Autana Tepui stands 1,300 m above the forest floor. A uniquecave runs from one side of the mountain to the other.
*Ptaritepui's sheer rock walls are so isolated, it is believed a high number of endemic plant and animal species could be found there.
*Sarisariñama Tepui, famous for its almost perfectly circular sinkholes which go straight down from the mountain top - the largest such sinkhole is 350 meters in diameter and depth (purportedly created by groundwater erosion). They harbor an ecosystem composed of unique plant and animal species at the bottom.ee also
*
Canaima National Park
*Geography of South America References
*Much of the text of this article comes from [http://de.wikipedia.org/wiki/Tepui the corresponding German-language Wikipedia article] , retrieved on 16 February 2006, which uses the following sources:
**Uwe George: "Inseln in der Zeit". GEO - Gruner + Jahr AG & Co., Hamburg, ISBN 3-570-06212-0.
**Roland Stuckardt: "Sitze der Götter". terra - Heft 3/2004, Tecklenborg Verlag, Steinfurt.External links
*http://www.worldwildlife.org/wildworld/profiles/terrestrial/nt/nt0169_full.html
* [http://www.lastrefuge.co.uk/data/articles/tepuis/Tepuis_story_page1.html The Making of the Tepuis Film : "The Living Edens : The Lost World"]
* [http://travel.mongabay.com/venezuela/ Mongabay.com] -- pictures from Tepuis in Venezuela.
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