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
Sioux Falls, South Dakota regional health care center. There are four major hospitals in Sioux Falls: Sanford Health (formerly Sioux Valley), Avera McKennan Hospital, the South Dakota Veterans Affairs Hospital, and the Avera Heart Hospital of South Dakota. Sanford Health and Avera Health are the largest and second largest employers in the city, respectively. Emergency medical services (EMS) are provided by Paramedics Plus and Sioux Falls Fire Rescue. Companies based in Sioux Falls include Raven Industries, retailers Lewis Drug and Sunshine Foods, as well as communications companies SONIFI Solutions and Midcontinent Communications. Because of the relatively long distances between Sioux Falls and larger cities,