The significance of iron ooids from the middle Eocene of the Transylvanian Basin, Romania

Gondwana Research(2022)

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Abstract
•Iron ooids from the Eocene Transylvanian Basin intermix with nummulites.•Ooid cortex and nucleus are made of goethite. Nummulites preserve calcareous shell.•Iron ooids were transported in places of nummulite accumulation.
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Key words
Ironstone,Coated grains,Goethite,Bartonian,Ferruginous sea water
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