- universal stratigraphic classification
- 统一: unify; unite; integrate
- 地层: stratum; layer; serati; geos ...
- 划分: divide; partition; repartiti ...
- 统一地层划分(或分类): universal stratigraphic classification
- 地层划分: stratigraphic classification; stratigraphic division; stratigraphical division; subdivision
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