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The Chiribiquete Plateau is a sandstone topped plateau with an elevation of 900 m (2,953 ft) that forms the western edge of the shield. The plateau is separated from the eastern Andes by the thick Neogene sediments of the Sub-Andean Trough that runs along the northern and western rim of the Guiana Shield.
The Guiana Shield forms the northern part of the Amazonian Craton, the core of the South American continent. Most of the geology of northern Guyana consists of Palaeoproterozoic Orosirian greenstone belts (Barama-Mazaruni Supergroup) intruded by granites.
The oldest rocks in Venezuela formed during the Precambrian and occupy the Guiana shield in the southern tier of the country near Guyana and Brazil, east of the El BaUl swell. In the western Guiana Shield, within the Amazonas Territory, Precambrian Roraima Formation zircon grains have been dated with uranium-lead dating and rubidium-strontium ...
Mount Roraima is a flat-topped mountain, typical of the Guyana Shield, [12] with an elevation of about 1,200 m (3,900 ft) in the southeast and only about 600 m (2,000 ft) in the northwest. [7] The south, southeast, east, northeast and northwest faces are all formed by straight cliffs up to about 1,000 m (3,300 ft) high.
The Guiana Shield occupies the southern region of the Orinoco River and the northern region of the Amazon River, between the plains of Colombia and Venezuela and the Atlantic Ocean. It covers the whole south of Venezuela and the south of the Orinoco. It has the oldest rocks in the country. There are archaic rocks with more than 3,000 million years.
The north of French Guiana corresponds to a synclinorium composed of the Paramaca series on which sandstone and fluviatile conglomerates lie unconformably. Shield rocks in Guyana are all dated between 1.6 and 2.5 billion years ago. The Quaternary lands are located in the northern part of Guyana, near the coast, unconformably on the Paleozoic lands.
Guiana Shield; I. Indian Shield; M. Man Shield; T. Tuareg Shield; W. Western Ethiopian Shield This page was last edited on 28 October 2024, at 06:48 (UTC). Text is ...
The Cerros de Mavicuri are three hills, located in eastern Colombia, 50 km (31 mi) south of the city of Inírida on the Inírida River.Geologically, the mountains are part of the Guiana Shield.