 To the west are the sandstone-derived Barrabool Hills and basalt Mount Duneed, and the volcanic plains to the north of Geelong extend to the Brisbane Ranges and the You Yangs.Soils vary from sandy loam, basalt plains, and river loam to rich volcanic soils, suitable for intensive farming, grazing, forestry, and viticulture.Many materials used to construct buildings were quarried from Geelong, such as bluestone from the You Yangs and sandstone from the Brisbane Ranges.