Continental drift is created at spreading centers, and this, along with subduction, drives the system of plates in a chaotic manner, resulting in continuous orogeny and areas of isostatic imbalance. The theory of plate tectonics explains all this, including the movement of the continents, better than Wegener's theory. Hans Stille and Leopold Kober opposed the idea of continental drift and worked on a "fixist" geosyncline model with Earth contraction playing a key role in the formation of orogens. Other geologists who opposed continental drift were Bailey Willis, Charles Schuchert, Rollin Chamberlin and Walther Bucher. In 1939 an international geological conference was held
The Association for the Study of Play the University of Illinois at Urbana–Champaign (then the University of Illinois) and an affiliate professor in the Department of Anthropology. The scholars who met there formed the "Cultural Anthropology of Play Reprint Society." The next year, Michael Salter organized the first formal meeting of the new organization at the University of Western Ontario during the North American Society for Sport History (NASSH) convention. Participants renamed the organization "The Association for the Anthropological Study of Play" and elected B. Allan Tindall as president. In 1987, the organization changed its name to "The Association for the Study of Play" (TASP). The proceedings