Abiotic features
The shoreline on which the karst features sit is interpreted as the southern extension of the Garden Island Ridge, which intersects the coastline at Halls Head (Semeniuk, 1995), and continues further south inland as the Mandurah Eaton Ridge. The coastal cliffs and outcrops represent the Pleistocene aeolian calcarenite and Tamala limestone which is overlain by the Quaternary Quindalup sand dunes. Features present include shoreline platforms, wave cut notches and splash zones, cross-cutting bedding, paleosol horizons, rhizolith fossil root structures, solution pipes, karst formations, and calcrete layers. The processes of erosion including physical, chemical and bioerosion can be witnessed along the shoreline.