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广西区调四分队一九八四年在南丹县六寨一带进行区域地质填图时,于六寨镇西800米处,晚石炭世地层中发现阿谢尔期菊石群,这是继苏联乌拉尔西部、北美西南部、帝汶岛和帕米尔东南部发现后的第五个发现点,也是我国首次发现。阿谢尔期介于石炭纪与二选纪之间。它是从阿丁斯克阶(广义)的下部划分出萨克马尔阶(广义),再由萨克马尔阶底部划分出阿谢尔阶,并于1960年全苏石油地质研究所主持召开的国际石炭一二迭纪界线会议决定将二迭纪底部划在阿谢尔阶,即北美的Properrinites带之底。这次发现阿谢
When the Quaternary Regiment of Guangxi Province conducted a regional geological mapping in the vicinity of Liuzhai in Nandan County in 1984, it discovered an Ascenea ammonoid cluster in the Late Carboniferous formation at 800 meters west of Liuzhai, The fifth discovery after the discovery in western Urals of the Soviet Union, southwestern North America, Timor-Leste and southeast of Pamir is also the first discovery in our country. Asherian period between the Carboniferous and the second election discipline. It divides the Saymark (broad sense) from the lower part of the Assinskian (broad sense), divides the Asherian order from the bottom of the Samarkand, and co-hosts the International Carboniferous The Second Permian Boundary Conference decided to place the bottom of the Permian at the bottom of the Ascell, the North American belt of the Properrinites. Asher found this time