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浙江江山是1959年全国第一次地层会议的现场会议地点之一,江山下古生代地层也做为浙西标准剖面之一,但过去认为宁国组的下界是以Cardiograptus amplus带的底部,经过研究在黄泥岗宁国组下部有一走向断层,使宁国组下部的Azyg-ograptus在标准剖面上缺失,因此江山宁国组底界是Azygograptus suecicus带底部。 江山的宁国组无论上部和下部都有石灰岩透镜体的存在,不是单一的笔石页岩。
Zhejiang Jiangshan was one of the site of the first strata conference in China in 1959. The Paleozoic strata in Jiangshan are also one of the standard sections of western Zhejiang. However, in the past, the lower boundary of the Ningguo Formation was based on the bottom of the Cardiograptus amplus, There is a strike-fault in the lower part of the Ningguo Formation in Huangniigang that Azyg-ograptus in the lower part of the Ningguo Formation is absent from the standard profile, so the bottom boundary of the Jiangshan Ningguo Formation is the bottom of the Azygograptus suecicus belt. The Jiangning Ningguo Formation has limestone lenses both in the upper and lower parts and is not a single penolith shale.