Early complex life at the Precambrian / Cambrian boundary

At 10.2 kilometres in from the turnoff from the Outback Hwy into Parachilna Gorge, the geological boundary between Precambrian period and Cambrian period sediments can be sighted.

Early life: fossilised worm burrows in limestone at the Cambrian boundary.

To the south of the road, a prominent outcrop of Rawnsley Quartzite marks the Precambrian layer. At the base of the western slope can be found the Precambrian / Cambrian boundary.

Blocky Precambrian quartzite (left) transitions to Cambrian limestone (right)

Ripple marks in the quartzite can be seen at the geological boundary.