The Hunter Fault System or "Lineament" separates the Permian and Triassic of Sydney Basin in New South Wales from the relatively complicated region to the north and east with exposed Carboniferous and older rocks and an increasing amount of identified Permian. David in his inimitable fashion grasped the essentials in 1907. He noted that the fold movements began towards the end of the Upper Permian with an important phase between the Upper Coal Measures and the Narrabeen Series. He also noted the main north-south component. The interest kindled by David was reflected in the work of Browne, Carey, Osborne, Raggatt, and Voisey. These workers established that the Carboniferous was affected by tectonic movement prior to the Permian and that the main ("orogenic") folding of the Permian/Triassic began with deposition of the Muree Formation and continued during the Upper Permian with overthrusting at the end of the Permian followed by strong rotational stress. This entire episode was called the Hunter-Bowen Movement by Carey and Browne in 1938. They also noted that the area of the subsequently developed Sydney Basin supplied sediment in the Carboniferous to the north and east. Raggatt, in his unpublished thesis of 1938 had already concluded that increasing compression led to upthrusting and eventually to torsion. Much of this seems to have been lost sight of in recent work. Current work confirms that the Permian/Triassic folding began with the Muree and that prior to this in the Permian a northwest to southeast graben was present to the south and west of the Hunter structure. Prior to the Permian the area of the Sydney Basin supplied detritus in the Carboniferous north and east of the Hunter structure apparently indicating a long-lived structure or lineament on which a reversal of movement took place.