Biostratigraphic zonation and mark-fossil erection should be based on restoring evolutionary pedigrees or occurrence sequences, and the boundary should be confirmed at the horizon of their first appearance.
Biostratigraphic zonation and mark-fossil erection should be based on restoring evolutionary pedigrees or occurrence sequences, and the boundary should be confirmed at the horizon of their first appearance.
生物地层学研究一定要以恢复演化谱系或发生序列为基础，界线化石标志应该选在其“首现”层位。