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 Defence of Duffer's Drift was written by Albert J. Marckwardt and Michael Burgoyne. The book follows a young lieutenant through successive lessons while conducting stability and counterinsurgency operations in Iraq. The winter 2005 edition of the "Canadian Army Journal" contained the following praise: Paul Hoffman, in his sequel to The Left Hand of God, The Last Four Things, used the example of Duffer's Drift by name as an exercise for Thomas Cale to solve for a defensive position for The Redeemers against the more mobile Commandos of the Folk. The problem set for Cale is to discover how to defend such a position with