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桂北兴安发育有一套奥陶系至志留系底部的含笔石浅变质的碎屑岩地层,自下而上可分成3个岩石地层单元,即升坪组(下部),黄隘组(中部)和田岭口组(上部)。这些地层的笔石自下而上可分为奥陶系Corymbograp-tus cf.balticus层,Expansograptus hirundo带,Exigraptus clavus-Undulograptus austrodentatus带,Didymogra-ptus artus带,Dicellograptus sextans带,Leptograptus flaccidus trentonensis层,Dicellograptus elegans层,Dicel-lograptus ornatus带,Appendispinograptus venustus层及志留系底部的Neodiplograptus modestus层。
There are a series of lithospheric metamorphic clastic rocks in the Ordovician-Silurian basement in Xingan County, northwest of Xingan Mountains. They can be divided into three lithostratigraphic units from bottom to top, that is, Shengping Formation (lower part), Huangai Formation Central) and Tianlingkou group (upper). The lithospheric rocks in these strata can be divided into the Ordovician Corymbograp-tus cf.balticus, Expansograptus hirundo, Exigraptus clavus-Undulograptus austrodentatus, Didymogra-ptus artus, Dicellograptus sextans, Leptograptus flaccidus trentonensis, Dicellograptus elegans layer, Dicel-lograptus ornatus band, Appendispinograptus venusus layer, and Neodiplograptus modestus layer on the bottom of the Silurian.