What does this research mean for the field?

During Oceanic Anoxic Event 3, ocean fertility varied locally rather than globally, and synchronous acmes of Micula and Marthasterites indicate large-scale surface water perturbations independent of seafloor anoxia. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To resolve the paleoecological and paleoceanographic drivers of Cretaceous Oceanic Anoxic Event 3 (OAE3) using quantitative calcareous nannofossil records across multiple ocean basins.

August 29, 2026Paleoceanography and Paleoclimatology

Revised Calcareous Nannofossil Biostratigraphy and Paleoceanography of Cretaceous Oceanic Anoxic Event 3: From Local to Global Perturbations

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Authors

EEElisabetta Erba FMFrancesco Miniati CBCinzia Bottini

Discussion

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Overview

Biostratigraphic analysis reveals synchronous surface-water perturbations across the Atlantic and Indian Oceans during OAE3, suggesting widespread ocean stratification rather than global...

Key Points

To resolve the paleoecological and paleoceanographic drivers of Cretaceous Oceanic Anoxic Event 3 (OAE3) using quantitative calcareous nannofossil records across multiple ocean basins.
Conducted quantitative nannofossil assemblage analyses on marine sediment core samples from multiple sites in the Atlantic and Indian Oceans.
Calculated nannofossil nutrient and cold-water temperature indices and synthesized literature abundance data for Micula and Marthasterites taxa across the Coniacian–Santonian interval.
Nutrient indices indicate that elevated fertility was locally restricted to equatorial upwelling zones and coastal runoff areas rather than representing a global fertilization event.
Synchronous acmes of Marthasterites furcatus and five distinct abundance peaks of Micula staurophora document supra-regional surface-water perturbations lasting 100–500 kyr, linked to extreme ocean stratification and deep nutriclines.
The identified Micula and Marthasterites abundance peaks establish revised, supra-regional biostratigraphic markers across the Turonian/Coniacian, Coniacian/Santonian, and Santonian/Campanian boundaries.

Cite This Study

Erba et al. (2026) studied this question.

synapsesocial.com/papers/6a92997e8e5d7d1fc0c1173d https://doi.org/10.1029/2025pa005218

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August 29, 2026Paleoceanography and Paleoclimatology

Revised Calcareous Nannofossil Biostratigraphy and Paleoceanography of Cretaceous Oceanic Anoxic Event 3: From Local to Global Perturbations

View Full Paper

Ask AI

Bookmark

Authors

EEElisabetta Erba FMFrancesco Miniati CBCinzia Bottini

Discussion

Member takes

Overview

Biostratigraphic analysis reveals synchronous surface-water perturbations across the Atlantic and Indian Oceans during OAE3, suggesting widespread ocean stratification rather than global...

Key Points

To resolve the paleoecological and paleoceanographic drivers of Cretaceous Oceanic Anoxic Event 3 (OAE3) using quantitative calcareous nannofossil records across multiple ocean basins.
Conducted quantitative nannofossil assemblage analyses on marine sediment core samples from multiple sites in the Atlantic and Indian Oceans.
Calculated nannofossil nutrient and cold-water temperature indices and synthesized literature abundance data for Micula and Marthasterites taxa across the Coniacian–Santonian interval.
Nutrient indices indicate that elevated fertility was locally restricted to equatorial upwelling zones and coastal runoff areas rather than representing a global fertilization event.
Synchronous acmes of Marthasterites furcatus and five distinct abundance peaks of Micula staurophora document supra-regional surface-water perturbations lasting 100–500 kyr, linked to extreme ocean stratification and deep nutriclines.
The identified Micula and Marthasterites abundance peaks establish revised, supra-regional biostratigraphic markers across the Turonian/Coniacian, Coniacian/Santonian, and Santonian/Campanian boundaries.

Cite This Study

Erba et al. (2026) studied this question.

synapsesocial.com/papers/6a92997e8e5d7d1fc0c1173d https://doi.org/10.1029/2025pa005218

View Full Paper

Ask AI

Bookmark