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2002年,国际石炭纪地层委员会通过了新的杜内阶—维宪阶界线(或称维宪阶底界)定义,即“在有孔虫 Eoparastaffella ovalis 组—E.simplex 谱系中 Eoparastaffella simplex 的首次出现”。2003年,作者等向国际推荐广西柳州碰冲剖面作为全球维宪阶底界界线层型和点位。维宪阶底界位于第85层之底,以有孔虫 Eop- arasfaffella simplex 的出现为标志。本文补充了区域地质资料,对碰冲剖面作一简要介绍。
In 2002, the IMCF adopted the new definition of the Dune-Uyghurian boundary (ie, the Vientiane-Lower Bound) definition of “Eoparastaffella simplex in the Eioparastaffella ovalis group-E.simplex First appeared ”. In 2003, the author recommended to the international community the collision part of the collision between Liuzhou, Guangxi, as the boundary layer and point of the world dimensionality. The bottom boundary of the Vysehir level is at the bottom of the 85th floor, marked by the emergence of the Eoplasias simplex. This article complements the regional geological data and makes a brief introduction of the collision and erosion profile.