The southern-most tip of the Australia mainland is fantastic for a weekend away- camping, hiking and enjoying unspoilt, white sand beaches. The Prom is a granitic batholith from the lower Devonian.
As with the You Yangs, this granitic pluton rose to the crust due to its higher temperature, and lower density. It is thought that it intruded into the Ordovician Sandstones that we see as the basement rock throughout central and western Victoria. Unlike the You Yangs, the granitic batholiths are much larger, diverse and more widespread. They are eastward dipping and were created as a result of the Lachlan Orogen, which developed along the Pacific margin during the Paleozoic. In fact, it is so large that this granite mass extends to north-east Tasmania, which was joined to the mainland by a land bridge until 10,000 years ago when the climate warmed, melting ice sheets, raising the sea level and submerging the Bass Strait.