Donnybrook Sandstone, originating from the Jurassic period, is a felspathic sandstone with a principal bonding of kaolin or halloysite. Its colour varies from pure white to deep buff or exceptionally deep pink, the latter being very dense and strong. Its grain size varies from very fine to moderately coarse. Donnybrook Sandstone is available in the immediate vicinity of Donnybrook in the South of Western Australia. The townsite is on the eastern edge of the coastal plain amongst the foothills of the Darling Scarp, some 200 feet above sea level. The country near Donnybrook consists essentially of a highly dissected plateau between 1,000 feet and 1,500 feet above sea level.