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Scheme: ABCD EFG Pencil.png
Collection: EFG PalaeontologicalUnit Pencil.png
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PreservationAlterationText (also /PalaeontologicalUnit/PreservationAlteration/PreservationAlterationText): Free text relating to mineralogical changes in preserved specimens e.g. original shell material preserved, replacement minerals, re-crystallisation, silicification etc.

Constraints in the context of ABCD EFG: