 The north east of Tasmania began to form as part of the Lachlan Orogen with turbidity flows of mud and sand on to the ocean floor.In the Devonian the Tabberabberan Orogeny caused more folding, and intrusion of granite on the west and east coasts, and probably joined the east of Tasmania to the west.In the Permian period, conditions were again glacial and the Tasmania basin formed, with low sea levels in the Triassic.