Coastal Dune Zone Also known as the Perth Coastal Zone, the Coastal Dune Zone is made up of coastal sand dunes and calcarenite. Late Pleistocene to Recent (Quindalup and Spearwood Systems). Calcareous and siliceous sands and calcarenite. The Coastal Dune Zone includes the youngest dunes being the Quindalup dunes which occur nearest to the coast … Continue reading Coastal Dune Zone