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Jack Oliver is credited with providing seismologic evidence supporting plate tectonics which encompassed and superseded continental drift with the article "Seismology and the New Global Tectonics", published in 1968, using data collected from seismologic stations, including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
The Drift of new material since 1995's "Tilt", "The Drift" forms the second installment of the "trilogy" that concluded with 2012's "Bish Bosch." In the years between "Tilt" and "The Drift", Walker's released output comprised a few instrumental tracks on the soundtrack to the film "Pola X", a cover of Bob Dylan's "I Threw It All Away" on the "To Have and to Hold" soundtrack, and "Only Myself to Blame" from "The World Is Not Enough" soundtrack, as well as a few compilations of previously released material, including the retrospective box set "5 Easy Pieces". "The Drift" has been cited by many