Fig. 1

Summary of mapped surface geology and available constraining information. a Location of the project area in red compared to Georgina Basin subbasins with project area indicated in red [modified after Withnall et al. (2013)]. b Mapped surface geology, thick black line denotes margin of the Eromanga Basin, points are the MT sites used for the study. c Composite first vertical derivative and total magnetic intensity map of the study area showing a north–south strike for the magnetic basement units. Available exploration data for study area also shown, exploration drill holes annotated with intersected basement depths or maximum hole depth where basement was not intersected (indicated by + after depth)