The Cliefden CavesGeoheritage Site is multifaceted, containing internationally significant Ordovician fossil localities, limestone caves of national significance, a warm spring and tufa dams of state significance and the historically significant site where limestone was first discovered in inland Australia. It has been ranked among the 70 most significant fossil sites in Australia by the Australian Heritage Council (2012[2]) and as the thirteenth most significant limestone cave site in Australia by Davey.[3] The site was nominated to the Register of the National Estate by the Geological Society of Australia in the late 1970s and registered in 1987 (Place ID 958, File # 1/07/261/004).[4]