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Diazotrophic cyanobacteria as the major photoautotrophs during mid-Cretaceous oceanic anoxic events: Nitrogen and carbon isotopic evidence from sedimentary porphyrin

BiologyDiazotrophic CyanobacteriaEngineeringCold SeepsCretaceous PeriodBiological OceanographyOceanographySedimentary PorphyrinCarbon Isotopic EvidenceCyanobacteriaMarine BiologyPhotosynthesis