The Guiana Shield is one of the three cratons of the South American Plate. It is a 1.7 billion-year-old {fact|date=December 2013} Precambrian geological formation in northeast South America that forms a portion of the northern coast. The higher elevations on the shield are called the Guiana Highlands, which is where the table-like mountains called...
Found on
http://en.wikipedia.org/wiki/Guiana_Shield
(from the article `Colombia`) In the central part of the plain, between the Guaviare and Caquetá rivers, the eroded rocks of the ancient Guiana Shield are exposed, producing a ... ...area is called the Amazonian Shield. It occupies much of the eastern bulge of the continent. Smaller areas of Precambrian rocks to the north and ......
Found on
http://www.britannica.com/eb/a-z/g/79
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