在地质图件上以N+Q表示的沉积,在中国和蒙古境内发育都很广泛。这种沉积,在中亚细亚极有限的地区内也有所见。仅中国一国境内,这种沉积所占的面积就约32万—35万平方公里,等于全国领土的1/30(根据1954年版1:6000000比例尺的地质图大致估计)。在戈壁滩和西藏,这种沉积的分布最为广泛,其次是准噶尔。另外,在喀什噶 Sediments, represented as N + Q on geological maps, are extensively developed in China and Mongolia. This deposition is also seen in the very limited parts of Central Asia. In China alone, this deposition accounts for about 320,000-350,000 square kilometers, equivalent to one-tenth of the national territory (roughly estimated from the 1: 6000000 scale geological map of the 1954 edition). This deposit is most widely distributed in Gobi Desert and Tibet, followed by Junggar. In addition, Kashgar