Along a ridge named “Revelations Ridge” by Yuri Bolotin near Bilpin are a number of Aboriginal Stone Arrangements (STA), and Axe Grinding Grooves (AGG). Although the stones are not arranged in any obvious pattern, they appear to have been deliberately placed – and they are a different type of stone to that of the sandstone rock platforms on the ridge.
There are at least two platforms that appear to have stone arrangements.
There are two mote potential stone arrangements: one on the edge of a rock platform, where there are three stacked stones.
Another very small cluster of stones is on the edge of narrow slot, and potentially a marker for one of the only passages down this side of the ridge.
Further evidence of indigenous occupation are at least multiple axe grinding grooves, around many of the potholes on the extensive rock platform.