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在河南省焦作地区太原组典型剖面上,共鉴定出类11属18种及11个未定种。根据类的组合特征,建立了一个类化石带两个亚带:Sphaeroschwagerina延限带,Quasifusulina-Pseudofusulina组合亚带和Schwagerina-Boultonia组合亚带。类在该区的出现次序是:Sphaeroschwagerina→Pseudofusulina→Quasifusulina→Schwagerina,其组合特征与当时华北板块大规模海侵密切相关。根据焦作太原组L1灰岩中首现Sphaeroschwagerina及类的演替特征等证据,石炭系-二叠系(C-P)界线应在太原组L1灰岩之下,太原组应划归下二叠统。
In the typical section of Taiyuan Formation in Jiaozuo, Henan Province, a total of 18 species and eleven undetermined species were identified. Based on the assemblage characteristics, two subfacies of the fossil zone have been established: the Sphaeroschwagerina zone, the Quasifusulina-Pseudofusulina zone and the Schwagerina-Boultonia zone. The order of occurrence of this species in this region is: Sphaeroschwagerina → Pseudofusulina → Quasifusulina → Schwagerina, whose assemblage characteristics are closely related to the large-scale transgression of the North China Plate. Based on the evidence of the succession of the first Sphaeroschwagerina and its succession in the L1 limestone of the Taiyuan Formation in Jiaozuo, the boundary of the Carboniferous-Permian (C-P) line should be below the L1 limestone in the Taiyuan Formation, and the Taiyuan Formation should be assigned to the Permian.