 Cambrian fossils have been found in these younger rocks while no fossils have been found in those remaining at Hallett Cove.Today, the remains of the southern section of the Cambrian mountain range are known as the Mount Lofty Ranges which have eroded down to below .The 600 Ma Precambrian rocks at Hallet cove are separated from the 270 Ma Permian deposits by an unconformity.