abcd-efg:SectionUnitStratigraphy-PolarityChron

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SectionUnitStratigraphy-PolarityChron
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SectionUnitStratigraphy-PolarityChron (also /SiteStratigraphy/SiteSections/SectionLog/SectionUnitStratigraphy/MagnetostratigraphicDeterminations/MagnetostratigraphicDetermination/PolarityChron): Reference to numerical scheme for labelling time divisions based on magnetic anomalies and reversals

Constraints in the context of ABCD EFG: