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地层结构、岩石组合、物质组成特点及化石埋藏状态等资料分析表明，新第三纪晚期红层成因类型多样，但以风积粉尘堆积为主，特殊的形成方式导致了红粘土组成的均一性。地层微结构研究显示红粘土沉积后经历了强烈的土壤化作用。地层所记录的成因信息和古气候信息与第四纪黄土—古土壤的类似，暗喻了二者间的继承性，红粘土成因的初步研究表明我国黄土高原区内的粉尘堆积有可能始于新第三纪中新世晚期。
The data of stratigraphic structure, rock assemblage, material composition and burial status of fossils indicate that the red beds in the Late Neogene were of various genetic types, but the accumulation of aeolian dust is the main type. The formation of red clay is caused by the special formation pattern . The study of formation micro-structure shows that the red clay has undergone strong soil compaction after being deposited. The genetic information and palaeoclimate information recorded by the strata are similar to that of Quaternary loess-paleosol and imply the inheritance between the two. The preliminary study on the origin of red clay shows that dust accumulation in the Loess Plateau may start from the new Late Miocene.