parallel to the coast between the mouth of Kororoit Creek and Skeleton Creek. The ridges consist of well-stratified shell beds, and their composition and form suggests that they were not thrown up by storm waves but were formed as sea floor ridges and spits during the mid-Holocene era, when the sea level was 1–3 metres higher than at present. The present alignment of the golf course and its use as an open-space facility preserves the general form of the ridges. The ridges are important for analysing sea level changes over the last few thousand years. The site is one of a small number of mapped and dated localities on the Victorian coast that indicates higher Holocene sea levels. Altona Treatment Plant There are plans to open to the public, the living art sculpture named A Forest for Australia by Agnes Denes, an internationally renowned conceptual artist and a pioneer of environmental art, whose art works are often monumental in scale. In 1998, she planted 6000 endangered trees of varying heights (red gum, she oak and paperbark) into five intersecting spirals at the Altona Treatment Plant. The tallest trees were planted in the centre of each spiral, followed by the medium-height trees and the shortest trees towards the outer edges, thus forming each spiral into a step pyramid. Her spiral design considers the height and forms of each tree type when fully grown and overcomes the problem of land erosion and desertification at the site. References External links Cr Tony Briffa JP – Councillor for Altona Beautiful Altona Picturesque Altona Hobsons Bay Community Online Forum Attractions of Altona Map Facebook Page on Events & Activities in Altona "Friends of Truganina Parklands" "Truganina Explosives Reserve Preservation Society" "Friends of Westona Wetlands" "Kooringal Golf Club" "Altona Treatment Plant" Parks in Melbourne Wetlands of Victoria (Australia)