Kristin Bergmann
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View article: High-resolution record of global cooling during a large Mississippian positive carbon isotope excursion
High-resolution record of global cooling during a large Mississippian positive carbon isotope excursion Open
View article: Origins and Alteration of Ediacaran Carbonates Recording the Shuram Excursion in Oman
Origins and Alteration of Ediacaran Carbonates Recording the Shuram Excursion in Oman Open
The Shuram excursion is the largest known negative carbon isotope excursion in Earth's history. Recognized globally, it follows the Ediacaran Gaskiers glaciation and precedes a marked increase in the diversity and complexity of the earlies…
View article: Cretaceous Chert‐Hosted Microfossils Visualized With Synchrotron Ptychographic X‐Ray Computed Tomography (PXCT)
Cretaceous Chert‐Hosted Microfossils Visualized With Synchrotron Ptychographic X‐Ray Computed Tomography (PXCT) Open
Silicification of microfossils is an important taphonomic process that provides a record of microbial life across a range of environments throughout Earth history. However, questions remain regarding the mechanism(s) by which silica precip…
View article: Marine sulphate captures a Paleozoic transition to a modern terrestrial weathering environment
Marine sulphate captures a Paleozoic transition to a modern terrestrial weathering environment Open
The triple oxygen isotope composition of sulphate minerals has been used to constrain the evolution of Earth's surface environment (e.g., pO2, pCO2 and gross primary productivity) throughout the Proterozoic Eon. This …
View article: The Causes and Consequences of Ordovician Cooling
The Causes and Consequences of Ordovician Cooling Open
A long-term cooling trend through the Ordovician Period, from 487 to 443 Ma, is recorded by oxygen isotope data. Tropical ocean basins in the Early Ordovician were hot, which led to low oxygen concentrations in the surface ocean due to the…
View article: Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean
Ecosystem changes after Early Cretaceous seawater intrusion into the proto-South Atlantic Ocean Open
View article: Chronology of Ediacaran sedimentary and biogeochemical shifts along eastern Gondwanan margins
Chronology of Ediacaran sedimentary and biogeochemical shifts along eastern Gondwanan margins Open
Determining causal relationships between environmental change and early animal evolution has been limited by our lack of a robust temporal framework for the Ediacaran Period (635-539 million years ago). Here we present six new radioisotopi…
View article: Ecosystem transformation upon Aptian seawater ingress into the Proto-South Atlantic Ocean
Ecosystem transformation upon Aptian seawater ingress into the Proto-South Atlantic Ocean Open
The early evolution of the South Atlantic Ocean following the Cretaceous break-up of Gondwana is extensively recorded in rift basins along the conjugate margins of Africa and Brazil. For the Brazil margin, divergent views of the source and…
View article: Primary microfossiliferous chert in the Aptian Barra Velha Formation
Primary microfossiliferous chert in the Aptian Barra Velha Formation Open
The Barra Velha Formation and other Aptian pre‐salt deposits record the history of the proto‐Atlantic basin and the rifting of Gondwana. Studies have sought to characterize the depositional environment of the basin with a focus on carbonat…
View article: Volcanism takes a back seat driving global iron deposition after the Great Oxidation Event
Volcanism takes a back seat driving global iron deposition after the Great Oxidation Event Open
Clarifying linkages between oxygenation and the evolution of complex life requires identification of foundational controls on oxygenation, deoxygenation, and habitability. Massive iron formations are uniquely sensitive to levels of marine …
View article: Coupled change in ocean CO<sub>2</sub> chemistry and global climate in the Palaeozoic
Coupled change in ocean CO<sub>2</sub> chemistry and global climate in the Palaeozoic Open
View article: Do we need to have mineral-specific Δ<sub>47 </sub>: calibrations and/or acid fractionation factors and/or community standards ?
Do we need to have mineral-specific Δ<sub>47 </sub>: calibrations and/or acid fractionation factors and/or community standards ? Open
View article: Characterization of Clasts in the Glen Torridon Region of Gale Crater Observed by the Mars Science Laboratory Curiosity Rover
Characterization of Clasts in the Glen Torridon Region of Gale Crater Observed by the Mars Science Laboratory Curiosity Rover Open
The morphology and composition of clasts have the potential to reveal the nature and extent of erosional processes acting in a region. Dense accumulations of granule‐ to pebble‐sized clasts covering the ground throughout the Glen Torridon …
View article: Dolomite abundance in the North American rock record
Dolomite abundance in the North American rock record Open
The mineral dolomite (CaMg(CO3)2) forms in only small quantities in modern oceans, cannot be precipitated abiotically from unmodified seawater in laboratory experiments, yet comprises much of the carbonate rock record. The challenge of exp…
View article: The Shuram excursion: A response to climate extremes at the dawn of animal life
The Shuram excursion: A response to climate extremes at the dawn of animal life Open
The Ediacaran-aged Shuram excursion was the last and largest of the Neoproterozoic negative carbon isotope anomalies. Recognized in stratigraphic successions around the globe, it precedes diverse evidence for macroscopic, multicellular lif…
View article: Temperature: a key driver of Earth's habitability over the last billion years
Temperature: a key driver of Earth's habitability over the last billion years Open
The habitability and ecology of Earth is fundamentally shaped by surface temperature, but the temperature history of our planet is not easily reconstructed, especially before the evolution of early biomineralizing animals. This work presen…
View article: Temperature: a key driver of Earth's habitability over the last billion years
Temperature: a key driver of Earth's habitability over the last billion years Open
The habitability and ecology of Earth is fundamentally shaped by surface temperature, but the temperature history of our planet is not easily reconstructed, especially before the evolution of early biomineralizing animals. This work presen…
View article: A billion years of temperature variability: a key driver of Earth's long-term habitability
A billion years of temperature variability: a key driver of Earth's long-term habitability Open
Earth and Space Science Open Archive This is a preprint and has not been peer reviewed. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are…
View article: Onset of carbonate biomineralization drove global reorganization of sedimentation and subsidence patterns
Onset of carbonate biomineralization drove global reorganization of sedimentation and subsidence patterns Open
Earth and Space Science Open Archive This is a preprint and has not been peer reviewed. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are…
View article: The Shuram excursion: A response to climate extremes at the dawn of animal life
The Shuram excursion: A response to climate extremes at the dawn of animal life Open
Earth and Space Science Open Archive This is a preprint and has not been peer reviewed. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are…
View article: Biomineralization: Integrating mechanism and evolutionary history
Biomineralization: Integrating mechanism and evolutionary history Open
Calcium carbonate (CaCO 3 ) biomineralizing organisms have played major roles in the history of life and the global carbon cycle during the past 541 Ma. Both marine diversification and mass extinctions reflect physiological responses to en…
View article: Fluctuations in ocean pH across the Ordovician-Silurian boundary
Fluctuations in ocean pH across the Ordovician-Silurian boundary Open
View article: Carbonate-associated sulfate constrains on the Cretaceous Barra Velha Formation
Carbonate-associated sulfate constrains on the Cretaceous Barra Velha Formation Open
View article: Constraining the Shuram δ<sup>13</sup>C Excursion with the δ<sup>44/40</sup>Ca – δ<sup>88/86</sup>Sr multi-proxy
Constraining the Shuram δ<sup>13</sup>C Excursion with the δ<sup>44/40</sup>Ca – δ<sup>88/86</sup>Sr multi-proxy Open
View article: Primary organic matter preserved in chert from the Pre-salt Barra Velha Formation
Primary organic matter preserved in chert from the Pre-salt Barra Velha Formation Open
View article: Nanoscale crystal fabric preserved in dolomite ooids at the onset of the Shuram Excursion
Nanoscale crystal fabric preserved in dolomite ooids at the onset of the Shuram Excursion Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Geophysical Research Letters. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn mo…
View article: Meta-analysis of Cryogenian through modern quartz microtextures reveals sediment transport histories
Meta-analysis of Cryogenian through modern quartz microtextures reveals sediment transport histories Open
Quantitative analysis of quartz microtextures by means of scanning electron microscopy (SEM) can reveal the transport histories of modern and ancient sediments. However, because workers identify and count microtextures differently, it is d…
View article: Nanoscale crystal fabric of primary Ediacaran dolomite
Nanoscale crystal fabric of primary Ediacaran dolomite Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Geophysical Research Letters. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn mo…
View article: Nanoscale crystal fabric of primary Ediacaran dolomite
Nanoscale crystal fabric of primary Ediacaran dolomite Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Geophysical Research Letters. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn mo…
View article: Arid Coastal Carbonates and the Phanerozoic Record of Carbonate Chemistry
Arid Coastal Carbonates and the Phanerozoic Record of Carbonate Chemistry Open
Ocean chemistry and carbonate sedimentation link Earth's climate, carbon cycle, and marine pH. The carbonate system in seawater is complex and there are large uncertainties in key parameters in deep time. Here, we link sedimentary textures…