Figure 1. Overview map of the regional tectonics, showing major normal faults in the Otway Basin (compiled from Douglas and Ferguson, 1988; Alley and Lindsay, 1995; Perincek and Cockshell, 1995; Moore et al., 2000). Cretaceous sedimentary rocks marked in gray. Close-up of the study area, showing borehole locations (Cooperative Research Centre [CRC]-1, -2) and the traces of the profiles (0–9) used for the extension versus age diagram (Figure 11). Major fault is marked.