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萨拉乌苏河位于陕西省与内蒙古自治区的交界处,它是无定河上游——红柳河的蒙语名称。这里出露有良好的晚更新世地层剖面,是我国北方晚更新世代表性地层——萨拉乌苏组的得名地。除萨拉乌苏河河谷外,定边、靖边、横山、榆林、神木及伊金霍洛旗、鄂托克旗、乌审旗等地,亦有萨拉乌苏组的普遍出露,面积计达2万余平方公里。这一广大范围,我们称其为萨拉乌苏地区,它实乃古萨拉乌苏湖的湖区所在。现今的毛乌苏沙漠,即发育于该湖盆内(图1)。
Sara Wusu River is located at the junction of Shaanxi Province and Inner Mongolia Autonomous Region, which is the uppermost Wudinghe - Hongliuhe Mongolian name. It is revealed here that there is a good Late Pleistocene stratum profile, which is the place of the Sara Wusu Formation, a typical Late Pleistocene stratum in northern China. In addition to the Sara Wusu River Valley, there are also common occurrences of the Sara Wusu Formation in Dingbian, Jingbian, Hengshan, Yulin, Shenmu and Yijinhuoluo, Etuokeqi, Area of up to 20,000 square kilometers. This vast area, which we call the Salawusu region, is actually the lakeshore of the ancient Sarausu Lake. The present-day Maowusu desert, which is developed in the lake basin (Figure 1).