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Jack Oliver is credited with providing seismologic evidence supporting plate tectonics which encompassed and superseded continental drift with the article "Seismology and the New Global Tectonics", published in 1968, using data collected from seismologic stations, including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
International Society for the Interdisciplinary Study of Symmetry on 2013, planned to take place every two years. This series is co-organised with the Research Group on Universal Logic: The Society is governed by a number of special Boards and Committees. The President of the International Society for the Interdisciplinary Study of Symmetry is Dénes Nagy. Among the Honorary Members of the Society are: Honorary Members of the Society (passed away) International Society for the Interdisciplinary Study of Symmetry The International Symmetry Society ("International Society for the Interdisciplinary Study of Symmetry", abbreviated name SIS) is a non-profit organization registered in Hungary (Budapest, Vármegye u. 7. II. 3., H-1052). Its