1080 Beach Cretaceous Volcanics

The headland shows a prominent light coloured silica rich dyke intruded into the 470 million year old sandstone. There are large boulders of basalt in the surf. The volcanic rocks are part of the massive 99 million year old stratovolcano of which the rocks of nearby Gulaga Mountain and Montague Island are also remnants. The parent stratovolcano lay to the southeast, one of a chain along eastern Gondwanaland, marking the beginning of continental rifting and separation that formed the Tasman Sea.