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粤东及琼东北第四纪老红砂分布于全新世和现代海岸风沙强烈作用带，其野外产状、沉积构造与海滩砂不同，粒度、石英砂磨圆度、石英砂表面微结构统计、孢粉和硅藻等分析证明这些老红砂与海岸沙丘砂有着成因上的联系，热释光年代为距今1．62—5．19万a，故它们是毗邻海滩的海岸风成砂，形成于未次冰期的低海平面期，其形成和分布与盛行风和向岸风的共同作用有关。
Quaternary red sand in eastern Guangdong and Qiongbei are strongly distributed in the sandstorms of the Holocene and the modern coast. Their field production, sedimentary structure and beach sand are different, the grain size, the roundness of quartz sand, the microstructure of quartz sand surface, Pollen and diatoms and other analysis shows that these old red sand and coastal sand dunes have a genetic relationship, the date of philimorphic dating back to 1.62-5.19 million a year, so they are adjacent to the beach coast wind sand, Formed in the period of low sea level in the sub-glacial period, its formation and distribution are related to the combined effect of prevailing wind and shoreward wind.