摘要石炭纪有孔虫演化快、分布广、数量丰富，对于浅水相地层划分对比具有特别的重要意义，维宪阶底界层型就是以有孔虫Eoparastaffella simplex首现定义的。石炭系维宪阶有孔虫生物地层在全球一些地区研究详细。在维宪阶命名地比利时维宪阶包括7个有孔虫带（Poty et al，2006）；石炭系研究的经典地区俄罗斯维宪阶划分了4个有孔虫带，
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