A detailed comparison of all younger, Holocene ages with existing chronologies from
beach ridges (Fig. 8b) shows that the evidence for sedimentary dynamics in relation to Holocene lake highstands is restricted to elevations below ~2.5 m AHD at our Lake Frome study site. This is below the possible elevation range for a connected and singlewater
body across both lakes as dictated by the Salt Creek sill at 5 ± 2 m AHD, and contrasts with beach deposits and beach ridges at ~5 m AHD dated to ~3.5e5.6 ka at Lake Callabonna (Cohen et al., 2012;Gliganic et al., 2014).