Threatened Ecological Communities (TECs) of tuart (Eucalyptus gomphocephala) woodlands are established on the limestone ridges, forming an important habitat for a diverse range of fauna and understorey flora adapted to the calcareous soils. On the sandier sections of the ridge, banksia woodlands support a rich assemblage of species, including nectar-feeding birds, small mammals, and a complex understorey of shrubs and wildflowers. In areas where the sand layer is shallow and directly overlies limestone outcrops, heath scrub communities dominate, composed of low, dense vegetation that provides habitat for specialist reptile and invertebrate species. Collectively, these communities contribute to the region’s biodiversity and ecological connectivity, making the ridge a significant refuge for both flora and fauna.

This ridge consists primarily of quartz sand interspersed with limestone lenses, reaching elevations of up to 70 m, and overlies Tamala Limestone. The Spearwood dune system reflects interglacial Pleistocene sedimentary processes, formed through the accumulation of nearshore and coastal marine deposits during interglacial periods. These deposits subsequently lithified into shore-parallel coastal limestones, which were later subject to karst development, weathering, and calcrete formation during subsequent interglacial phases. The area features a shoreline sand barrier dominated by quartz sands with localized calcareous sand lenses, exposing Pleistocene dune sands, Tamala Limestone, and associated karst formations.

Infrastructure is limited, more signage and infrastructure needed.