The significance of iron ooids from the middle Eocene of the Transylvanian Basin, Romania
Gondwana Research(2022)
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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