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Wikipedia: The Guiana Shield is one of the three cratons of the South American Plate. It is a 1.7 billion year old 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 impressive and mysterious table-like mountains called tepuis are found.
![[Map showing extent of Precambrian rocks in Guyana Shield]](http://images.ookaboo.com/photo/s/Guyana_Shield_s.jpg "Map showing extent of Precambrian rocks in Guyana Shield")
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 from :en:Geologyguy |
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