Mesozoic and Cenozoic continental sandstone and shale are widely exposed in the Tarim and Junggar basins characterized by dried climate and strong weathering which provides good conditions for the development of the yardang.
新疆塔里木盆地和准噶尔盆地中广泛发育中新生界,特别是新生界的陆相砂泥岩。