Stratigraphic framework and forced fold characterisation
The Top Mungaroo horizon dips eastwards towards Fault 1 ( Figure 4D-F, 5A). Local, abrupt changes in Top Mungaroo depth are observed across the study area where the horizon ( Figure 5A): (i) is offset by up to ∼0.5 s TWT across minor, ∼NE-SW-striking normal faults (Fault Population A), and (ii) overlies or is crosscut by the western edge of the sill. Although the underlying Intra-Mungaroo horizon cannot be mapped fully across the study area, where identified, it broadly parallels the Top Mungaroo horizon (e.g. Figure 4D-F). In most places the Intra-Mungaroo horizon is located >0.75 s TWT beneath the Top Mungaroo horizon, except where it extends beneath the sill and the Top Mungaroo is locally uplifted (e.g. Figure 4D-F). Within the Triassic strata, a subtle vertical zone of disruption, which extends downwards from Fault 1 at ∼5 s TWT, is present beneath the sill ( Figure 4E); this vertical zone of disruption has previously been interpreted as the seismic expression a dyke [Magee and Jackson 2020]. Intra-Jurassic R2 is only observed in the hanging wall of Fault 1, where it is locally offset by faults within Fault Population A ( Figure 5B). Uplift of supra-sill horizons, relative to their projected regional trends, is clearly demonstrated by Intra-Jurassic R2 where the margins of a dome-shaped fold directly overlie the western and eastern lateral tips of the sill ( Figure 4D-F and 5B). The western margin of the dome-shaped fold is a Wverging monocline, which includes folded strata between the Top Triassic and Intra-Jurassic R2, whereas its eastern margin has a subtle synformal geometry immediately adjacent to Fault 1 that is only expressed between Intra-Jurassic R1 and R2; below Intra-Jurassic R1 there is no apparent folding of horizons adjacent to Fault 1 ( Figure 4D-F and 5C). Above the deepest part of the Top Sill horizon (i.e. ∼3.81 s TWT), the Intra-Jurassic R2 horizon is currently located at ∼3.25 s TWT. Although relatively flat-topped, superimposed onto the dome-shaped fold at the Intra-Jurassic R2 level are three broad areas of elevated relief (up to ∼3.26 s TWT), separated by subtle lows (∼3.30 s TWT; Figure 5B). Within the northern-most region of elevated relief is a thin narrow (<100 m wide), arcuate depression that extends for ∼3 km along strike and coincides with an apparent reverse fault ( Figure 4F and 5C). 
### Language ###
English

### Assessment ###
The text describes specific measurements of depths in TWT (Two-Way Time), and a user might want to know the depth of a particular geological feature.

### Query ###
How deep is the deepest part of the Top Sill?
How deep is the deepest part of the Top Sill?