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Guiana Shield (South America) Editor Thu, 02/07/2019 - 20:46
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.
Magdalena Valley Dry Forests Ecoregion (South America) Editor Tue, 01/29/2019 - 21:23
The Magdalena Valley dry forests ecoregion is located in Colombia along the upper Magdalena River. There are many endemic species, but much of the original habitat has been destroyed by agriculture and over-grazing.