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
Thornton Line its amendment the Coxe–Barclay Line (1688) which was disowned by the East Jersey proprietors in 1695. While it appears on Worlidge's map of the two Jersey colonies, it was never formally adopted. Thornton Line The Thornton Line is a boundary line or partition line surveyed in 1696 through the Province of New Jersey during the colonial period, separating the territory into two proprietary colonies: the Province of East Jersey and the Province of West Jersey. New Jersey was divided into two proprietary colonies after the Duke of York's 1664 grant of the colony to Sir George Carteret and John Berkeley,