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
Valley Falls, Oregon moved approximately one mile west to the junction of U.S. Route 395 and Oregon Route 31. The Valley Falls post office was closed in 1943. The unincorporated community of Valley Falls is located at the junction of U.S. Route 395 and Oregon Route 31 in the high desert country of Lake County in south-central Oregon. There are only five structures at the site. The main business is a combined gas station and store, located on the west side of the highway, south of the junction. There is also a recreational vehicle park and a guest ranch nearby. Valley Falls is