Wallace Line by the Sahul Shelf to New Guinea. The biogeographic boundary known as Lydekker's Line, which separates the eastern edge of Wallacea from the Australian region, has a similar origin to the Wallace line. During ice age glacial advances, when the , both Asia and Australia were united with what are now islands on their respective continental shelves as continuous land masses, but the deep water between those two large continental shelf areas was, for over 50 million years, a barrier that kept the flora and fauna of Australia separated from those of Asia. Wallacea consists of islands that were not
William S. Wallace of the V Corps on July 18, 2001. He commanded the corps during the 2003 invasion of Iraq until June 14, 2003, when he left to become the commanding general of the Army's Combined Arms Center at Fort Leavenworth, Kansas. His replacement in Iraq was Lt. Gen. Ricardo S. Sanchez. Wallace assumed command of the United States Army Training and Doctrine Command (TRADOC) at Fort Monroe, Virginia, on October 13, 2005. Wallace relinquished command of TRADOC, and retired from the United States Army on December 8, 2008. Among his awards and decorations are: William S. Wallace William Scott Wallace, is