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Thallium isotope ratios in shales from South China and northwestern Canada suggest widespread O2 accumulation in marine bottom waters was an uncommon occurrence during the Ediacaran Period

Marine GeologyEngineeringThallium Isotope RatiosPaleoceanographyIsotope GeochemistryCold SeepsOrganic-rich Sedimentary RockMarine ChemistryGeologyMarine Bottom WatersOxygen IsotopeGeochemistryEdiacaran PeriodSedimentologyEarth Science