Continental drift Permian era but failing to account for glaciation in India, Australia and South Africa. Geophysicist Jack Oliver is credited with providing seismologic evidence supporting plate tectonics which encompassed and superseded continental drift with the article "Seismology and the New Global Tectonics", published in 1968, using data collected from seismologic stations, including those he set up in the South Pacific. It is now known that there are two kinds of crust: continental crust and oceanic crust. Continental crust is inherently lighter and its composition is different from oceanic crust, but both kinds reside above a much deeper "plastic" mantle. Oceanic crust
Society for the Study of the Sudans UK Centre in Rutland Gate. More recently, international conferences have been convened in collaboration with the U.S.-based Sudan Studies Association (SSA) in Durham, England (2000), Washington DC (2003), Bergen, Norway (2006), Pretoria (2009) and Bonn (2012). Sandy Sanderson was the Society's second president, followed by the Sudanese novelist Tayeb Salih. The name was changed in 2016 to reflect the independence of South Sudan. Society for the Study of the Sudans UK The Society for the Study of the Sudans UK (SSSUK) is the largest UK-based professional association for scholars of Sudan and South Sudan. Founded in 1986, the Society's "overall aim