General Discussion, page-246

Leigh Creek Coal Measures (austhrutime.com)PS The folding occurred more than 250Ma before the coal basins filled up.

The folding occurred in sediments up to 24,000m in thickness.

Delamerian orogeny[edit]

Sedimentation in the Adelaide Superbasin ended in the middle Cambrian, when tectonic inversion occurred along the eastern margin of Neoproterozoic and Cambrian cratonic Australia and the margin became a subduction zone of the Palaeo-Pacific.^[1][15] After this time the region experienced an orogeny (mountain-building period) extending into the Ordovician. Foden et al. (2006) suggest that this orogeny lasted from ~514 Ma to 490 Ma. This event is called the Delamerian Orogeny, named after Delamere, a small town on the Fleurieu Peninsula where evidence was found for the event. The orogeny caused substantial folding, buckling, and faulting of the strata, and resulted in the creation of a major mountain range, the eroded stumps of which can today be seen as the Mount Lofty and Flinders Ranges. Not all of the basin experienced tectonic activity; the deposits on the Stuart Shelf and Coombalarnie Platform to the north-west and north-east remained undisturbed (and still do today).

Accompanying this folding and faulting were several intrusions: the granites at Victor Harbor were intruded at this time, as were those at Palmer in the eastern South Mount Lofty Ranges.^[15][16]

for more see: Adelaide Superbasin - Wikipedia

Leigh Creek Coal Measures (austhrutime.com)