Guiana Shield Guiana Shield 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 table-like mountains called tepuis are found. The Guiana Highlands are also the source of some of the world's most spectacular waterfalls such as Angel Falls, Kaieteur Falls and Kuquenan Falls. The Guiana Shield underlies Guyana (previously British Guiana), Suriname (previously Dutch Guiana) and French Guiana (or Guyane), most of
Shoshone Falls to the Shoshone Falls area. Over the next thirty years, American and British-Canadian fur trappers hunted throughout south-central Idaho and are believed to have observed Shoshone Falls. However, none of those who kept journals mentioned the feature. John C. Frémont passed through the Shoshone Falls area during his 1843 expedition, which aimed to map the country through which passed the western half of the Oregon Trail. None of his party observed the falls, however, because they left the river canyon (probably near Murtaugh) and cut southwest across a sandy plain to reach Rock Creek. They returned to the canyon rim