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Jack Oliver is credited with providing seismologic evidence supporting plate tectonics which encompassed and superseded continental drift with the article "Seismology and the New Global Tectonics", published in 1968, using data collected from seismologic stations, including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
Drift Desert, Arizona Drift Desert, Arizona Drift Desert is a former ranch and steamboat landing on the Colorado River, now a ghost town, in La Paz County, Arizona. Drift Desert was a ranch with a woodyard landing for the George Alonzo Johnson's steamboats on the Colorado River. It was located 102 miles up river from Yuma, Arizona, 30 miles above California Camp and 29 miles below La Paz, in what was then Yuma County, Arizona. Drift Desert appears on the 1861 Geological Map No. 1. Prepared by J.S. Newberry, M.D. Geologist to the Expedition. Explorations and Surveys. War Department. Map No. 1. Rio