Geological Sites

Geological Sites

When entering Victor Harbor you will wittness views of the Bluff summit, a famous local geological landmark. Located nearby in the Inman Valley, is Glacier Rock, also another famous geological attraction! Visit these sites to appreciate their origins close up!

The Bluff

(Rosetta Head)

This prominent headland is formed of granite. The granite originated when magma was squeezed up from deep in the continental crust during the mountain building episode which occurred about 500 million years ago. This is known because sediments left by the ice age, which occurred at that time, rest immediately on top of it, and boulders of granite were carried, by the ice, northwards. The smooth rounded profile of the Bluff is attributed to the erosive action of this ice sheet.

On top of the Bluff a plaque, commemorating the encounter between Matthew Flinders and the French explorer Nicolas Baudin in 1802, has been affixed to one of the many large rounded boulders, typical of weathered Victor Harbor granite.

Several granite islands can be seen from the Bluff. They also bear signs of having been smoothed by ice passing over them. Granite from West Island, to the south, was used for the base and the steps of Parliament House in Adelaide. It is now reserved for conservation of wildlife habitat.

The Bluff

The Bluff South

Glacier Rock

(Selwyn's Rock)

Inman Valley is located 14 km from Victor Harbor on the Yankalilla Road. It is home to one of the State's most geologically significant sites.

This was first recognised in 1859 by the geologist A.R.C. Selwyn when he noticed that the hard rock surface in the river bed, about 14km from Victor Harbor, had been planed, grooved and scratched in a way typical of ice movement. Above this surface, in the river bank, is a large ice transported boulder embedded in glacial sediments. These sediments can be found right through Inman Valley from Encounter Bay to Normanville.

You will also find the Glacier Rock Restaurant with a golf course set against the backdrop of majestic gum trees lining the banks of the Inman River.

Several walking trails can also be explored around the valley.