g. Tara Structure). Regional fault systems, considered to be reactivated basement faults, have also been identified in all seismic surfaces in different areas within the model domain. In addition to the major regional fault systems, this study has also identified several local faults. These, local

faults were observed in only one or two seismic surfaces and predated the Triassic. Evans and Roberts (1979) studied many seismic sections within and near the model domain, identifying frequent reverse faulting during the Permian. Much of this previously described fault activity occurred between the deposition of the Aramac Coal Measures (Early Permian) and the Betts Creek Beds (Late Permian). This is suggested by faulting that can be observed in the Aramac Coal Measures seismic surface but is not visible in the Betts Creek Beds seismic surface (Fig. 5). The first Olaparib price episode of tectonic activity in the area occurred prior to the deposition of the Galilee Basin units, as suggested by the significant uplift of the Maneroo Platform, controlled by the Hulton-Rand and Tara Structures (Fig. 4a and b). Tectonic activity after the deposition of the Aramac Coal Measures decreased significantly, and many

of the Early Permian faults appear to be absent in the Betts Creek Beds. Furthermore, most of the faults identified in the Betts Creek Beds are not evident in the Cadna-owie seismic surface (Fig. 5), with the exception of some regional faults (e.g. Hulton-Rand Structure, Tara Structure, Dariven Fault and Maranthona BMS 907351 Monocline), which are restricted to the northern part of the model domain. Early Permian activity is unknown in the Maneroo Platform area as the Galilee Basin sequences are absent there (Fig. 6). Another period of tectonic activity occurred between the deposition of the Cadna-owie and Toolebuc formations (both Early Cretaceous), as many faults observed in the Cadna-owie Formation are not observed in the Toolebuc

Formation (Fig. 5). In addition, most of the faults that impacted on these Eromanga Basin units are restricted to the southern part of the model domainand Early Cretaceous faulting was not observed where the Galilee Basin is present. The Corfield Fault is recognised as the only Early Cretaceous fault in the units of the Galilee and Eromanga basins within the model domain. A last episode isothipendyl of recognisable tectonic activity observed at regional fault systems occurred after the deposition of the Toolebuc Formation. Many of the regional faults have been mapped at the surface by the Geological Survey of Queensland (2012), indicating that an episode of tectonic activity occurred after the deposition of the entire Eromanga Basin sedimentary succession. The Tara Structure vertically displaces the Hutton Sandstone by 265 m (Fig. 4b), with a considerable variation of thickness on the opposing sides of the fault (125 m on the eastern side and only 25 m on the western side).