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Scheme: ABCD EFG Pencil.png
Collection: EFG EarthScienceSpecimen Pencil.png
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UnitStratigraphicDetermination-PolarityChron (also /EarthScienceSpecimen/UnitStratigraphicDetermination/MagnetostratigraphicDeterminations/MagnetostratigraphicDetermination/PolarityChron): Reference to numerical scheme for labelling time divisions based on magnetic anomalies and reversals

Constraints in the context of ABCD EFG: