It is widely believed that fragments of the northern Australian continental margin in New Guinea are being detached and translated westward in this shear zone until they collide with the eastern margin of Eurasia (Sundaland) in the region of Sulawesi Island. However, the details of terranetranslation, amalgamation, and docking remain poorly documented at this time. In particular, the timing of events is very poorly constrained, with estimates for the commencement of the SFZ ranging from early Miocene or older to Pleistocene. Investigations in the 1990s of the SFZ and the adjacent regions of Sulawesi and Irian Jaya (Indonesian New Guinea), including fieldwork in several of the SFZ island-terranes (Waigeo Island, Halmahera, Bacan, Obi Islands, and Sula islands), suggest a less mobilist interpretation of the region than previous reconstructions. SFZ did not begin to develop in its present form before the late Miocene.