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重新研究了宜昌王家湾 ,宜昌分乡 ,桐梓红花园和松桃陆地坪 4条上奥陶统上部至志留系底部的连续采集剖面。1999年 6月在捷克召开的第 8届国际奥陶系大会上提名宜昌王家湾和桐梓红花园剖面分别为赫南特亚阶的全球层型候选剖面 (GSSP)和辅助剖面。对赫南特亚阶及其上、下地层的生物带重新厘定 ,自下而上为 Foliomena-N ankinolithus/D.complanatus,D.complexus带 ,P.pacificus带 (包括下部亚带 ,T.typicus亚带和 Diceratograp-tus mirus亚带 ) ,N.extraordinarius- N.ojsuensis带 ,N.persculptus带 ,A.ascensus带和 P.acuminatus带。
Revisited the Yichang Wangjiawan, Yichang sub-Township, Tongzi Red Garden and Songtao land Ping 4 Upper Ordovician upper to the Silurian at the bottom of the continuous acquisition section. In June 1999, the 8th International Ordovician Assembly in the Czech Republic nominated the Yichang Wangjiawan and Tongzihong Garden sections as Global Stratigraphic Candidate Profiles (GSSP) and Auxiliary Profiles, respectively, of the Hernándezian Class. Redefinition of the Hernándezian and upper and lower strata of zooplankton from bottom to top are Foliomena-N ankinolithus / D.complanatus, D.complexus, P.pacificus (including lower subtypes, T.typicus Subtropic and Diceratograp-tus mirus subtypes), N. extraordinarius-N. ojsuensis, N. persicus, A. ascensus and P. acuminatus.