Dating back to the precambrian era
This is the highest of the tepuis with an average height of 2500 m and a maximum elevation to 2810 m.
These mountains are considered some ofthe oldest geological formations on Earth, dating back to the Precambrian Era.
(a) Saxifraga biflora in the eastern Swiss Alps at Fuorcla da Faller. These mountains are considered some ofthe oldest geological formations on Earth, dating back to the Precambrian Era.
(b, c) Saxifraga biflora at 2500 m at Champsaur in the French Alps, showing diversity of flower colour. One third of the plant species are unique to the plateau. 10.5 Mount Roraima, a sandstone plateau rising above the surrounding savannas and forest and lying between Venezuela, Guyana and Brazil.
At the highest sites plant communities cannot benefit from an input of seeds and other propagules washing or blowing down the mountainside from vegetation that lives above them.It is therefore not surprising that endemic species and subspecies are a feature of many high mountain floras.One third of the plant species are unique to the plateau.(Photo © Adrian Warren/ what are essentially islands of seclusion from which migrations, either in or out, are not easily accomplished.High mountain peaks, wherever they lie, from the poles to the tropics, with or without snow, are places of isolation for plant life.
Lacking the mobility of most birds and animals, the plants that grow in these upper altitude zones are confined there for life (Fig. In temperate and tropical regions, the slopes and valleys below the mountain peaks or tablelands will usually be covered in a vegetation type that belongs to a totally alien environment as compared with the region above the treeline.