There are many theories how these vertical structures were created, one of them is that a forest of Moonah trees was smothered by a sand dune and water seeping through the sand creating a crust around decaying trunks, other theories appear more plausible due to the very dense arrangement of vertical trunk like structures.

Petrified Forest - Portland visitor guide showing a virtual tour of 'Petrified Forest' linked to an interactive map with local and travel information. 360° panoramas from Victoria.