Figure 4. Seismic line A-A’ is a north-south 2-D line that shows the thrust may become listric below salt. The area has multiple salt sheets at several depths, implying different emplacement and burial histories. Please note the resolution of large-scale structural features below salt, such as large Pliocene/Miocene basins, deep rooted salt highs, and bounding fault systems. Clearly on this section, the early drilling was mainly for above salt structures and amplitude anomalies, whereas the deeper features were untested. Also important to the subsalt play is recognition of differences between thin-skinned tectonics above salt and deeper ‘thick-skinned’ tectonics. The structures above and below salt are mostly not linked, but some genetic ties can sometimes be inferred. For example, the imbricate nature of the Ewing Bank thrust system correlates with subsalt highs and lows. The Ewing Bank is a drowned Pleistocene reef that was moved upward into the photic zone by secondary diapirism on the salt sheets.