In this scenario the spit could be regarded as an erosional remnant of a previously more extensive body of fluvial and/or fluvio-deltaic sediment. However, the planform morphology is typical for coastal spits (e.g. Bird, 2000) and rather suggests an origin related to alongshore sediment transport by wind and wave dynamics. Given
the lack of sedimentological evidence of beach ridge detritus or bedding which could corroborate lateral accretion in the swash zone, Unit 3b e and the spit landform in general e may thus be the result of sediment accretion on a submerged bar immediately
downstream of an active deltaic sediment source such as Balcanoona Creek. In either case, the deposition of coarse-grained sands and pebbles between ~1 and 3 m AHD clearly implies a lake level probably not significantly higher than ~3e4 m (AHD) between ~4.2
and 4.9 ka.