Editing Purnululu National Park (section)

=== Geology ===
The Bungle Bungle Range is one of the most extensive and impressive occurrences of sandstone tower (or cone) [[karst]] terrain in the world. The Bungle Bungles were a plateau of [[Devonian]] sandstone,  carved into a mass of beehive-shaped towers with regularly alternating, dark gray bands of cyanobacterial crust (single cell photosynthetic organisms). The plateau is dissected by {{convert|100|-|200|m|adj=on}} deep, sheer-sided gorges and [[slot canyon]]s. The cone-towers are steep-sided, with an abrupt break of slope at the base and have domed summits. How they were formed is not yet completely understood.  Their surface is fragile but stabilized by crusts of [[iron oxide]] and bacteria. They provide an outstanding example of land formation by dissolutional weathering of sandstone, with removal of sand grains by wind, rain and sheet wash on slopes.<ref>{{cite encyclopedia|url=http://www.eoearth.org/view/article/155611/|title=Purnululu National Park, Australia|encyclopedia=[[Encyclopedia of Earth]]}}</ref>