during the Quaternary amounts to tens of meters, albeit this was not evenly distributed. For glacier erosion to be effective in shields a long "preparation period" of weathering under non-glacial conditions may be a requirement. In weathered and eroded shields inselbergs are common sights. List of shields The Canadian Shield forms the nucleus of North America and extends from Lake Superior on the south to the Arctic Islands on the north, and from western Canada eastward across to include most of Greenland. The Atlantic Shield The Amazonian (Brazilian) Shield on the eastern bulge portion of South America. Bordering this is the Guiana Shield to the north, and the Platian Shield to the south. The Uruguayan Shield The Baltic (Fennoscandian) Shield is located in eastern Norway, Finland and Sweden. The African (Ethiopian) Shield is located in Africa. The Australian Shield occupies most of the western half of Australia. The Arabian-Nubian Shield on the western edge of Arabia. The Antarctic Shield. In Asia, an area in China and North Korea is sometimes referred to as the China-Korean Shield. The Angaran Shield, as it is sometimes called, is bounded by the Yenisey River on the west, the Lena River on the east, the Arctic Ocean on the north, and Lake Baikal on the south. The Indian Shield occupies two-thirds of the southern Indian peninsula. See also Basement (geology) Craton Platform (geology) Notes Cratons Plate tectonics