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通过对滇东、黔南和桂林一带典型地层系统、微古生物序列、结合层序地层分析，发现位于扬子地台西南缘下石炭统中间界线地层内第一个海泛面出现的同时产生了Ｏｚａｗａｉｎｅｌｉｄａｅ最原始的代表——无旋脊“Ｅｏｐａｒａｓｔａｆｆｅｌａ”类群，而最大海泛面形成期间则发育了真正的Ｅｏｐ－ａｒａｓｔａｆｆｅｌａ，它们之间的序列关系代表了Ｏｚａｗａｉｎｅｌｉｄａｅ早期演化谱系。以有孔虫无旋脊的“Ｅｏｐａｒａｓｔａｆｅｌａ”—真正的Ｅｏｐａｒａｓｔａｆｅｌａ演化谱系中具二个壳圈、壳缘宽圆的原始Ｅｏｐ－ａｒａｓｔａｆｆｅｌａ出现为标志，作为杜内阶－维宪阶分界的下石炭统中间界线。这一界线在扬子西南缘位于大塘阶的万寿山组、祥摆组和黄金组第一段内部。
Based on the typical stratigraphic system, microfossil biological sequence and sequence stratigraphy analysis in the areas of eastern Yunnan, southern Guizhou and Guilin, it was found that Ozawainelidae appeared at the first sea surface in the middle of the Lower Carboniferous line in the southwestern margin of the Yangtze platform, The most primitive representative - no ridge “Eoparastaffela” taxa, and the largest sea pan noodles during the development of the real Eop-arastaffela, the relationship between them represents the Ozawainelidae early evolutionary lineages. Based on the Eoparastafela, a true Eoparastafela evolutionary pedigree with foraminifera without ridge, marked by the appearance of the original Eop-arastaffela with broad hull edges and wide margin, the Lower Carboniferous Middle line. This boundary is located in the southwestern margin of the Lantangshan Longevity Mountain Group, Xiang-pendulum group and gold within the first paragraph.