Stretching of the continental crust of the New England Orogen in the Permian period formed the Bowen-Gunnedah-Sydney Basin System. This was a foreland basin from Permian into the Triassic. Granites from this time also intruded. From middle to Late Triassic an ocean arc collided. This folded and trusted the surface contents of the basin starting in the east extending to the west.
