The Timor Sea region discussed in this Bulletin covers the Sahul Shelf and Timor Trough between 123Â° and 130Â° East longitude. The area includes a wide, stable continental platform bordered on one side by an ancient, low-lying, deeply weathered continent, and on the other by a moderately deep, tectonically unstable geosynclinal trough. The purpose of this Bulletin is to describe and interpret the morphology of this area, to define and characterize the sedimentary facies and their distribution patterns, and to discuss the topographic, oceanographic, geological, and biological factors that control them. The study forms part of a series of investigations of modern sedimentary facies in a variety of geological settings along the continental margins. See also Bulletin 83A (GeoCat # 111).