 Almost immediately the mountain range began eroding heavily and this process continued for another 200 Ma.The Precambrian rock of Black Cliff and the wave cut platform at Hallett Cove are all that remains of the base of the mountain range in this area and clearly shows complicated folding with several small faults visible.Erosion has removed rock dated less than 570 Ma, but younger overlaying rock (570 - 500Ma) is exposed further south between Sellicks Hill to Normanville.