1·A group of Quaternary gyttjor are discovered in Rimaqu basin in the Yellow River source area which formed the first terrace foundation, included gravel aleurite, aleurite and clay layer.
在黄河源区支流日玛曲河谷发现第四纪湖相沉积，以含砾粉砂、粉砂、粘土互层组合为特征，形成河流的第一阶地基座。