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The Heartbeat of the Oligocene Climate System
A 13-million-year continuous record of Oligocene climate from the equatorial Pacific reveals a pronounced “heartbeat” in the global carbon cycle and periodicity of glaciations. This heartbeat…
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Deep-sea paleotemperature record of extreme warmth during the Cretaceous
Oxygen isotope analyses of well-preserved foraminifera from Blake Nose (30°N paleolatitude, North Atlantic) and globally distributed deep-sea sites provide a long-term paleotemperature record for the…
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Evolution of middle to Late Cretaceous oceans—A 55 m.y. record of Earth's temperature and carbon cycle
A new 55 m.y. global compilation of benthic foraminifera δ 13 C and δ 18 O for the middle to Late Cretaceous shows that there was widespread formation of bottom waters with temperatures >20 °C during…
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Formation of the Isthmus of Panama
TLDR
An exhaustive review and reanalysis of geological, paleontological, and molecular records converge upon a cohesive narrative of gradually emerging land and constricting seaways, with formation of the Isthmus of Panama sensu stricto around 2.8 Ma.
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Warm tropical ocean surface and global anoxia during the mid-Cretaceous period
TLDR
Stable isotope records from multiple species of well-preserved foraminifera show that the thermal structure of surface waters in the western tropical Atlantic Ocean underwent pronounced variability about 100 Myr ago, with maximum sea surface temperatures 3–5 °C warmer than today.
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The Chicxulub Asteroid Impact and Mass Extinction at the Cretaceous-Paleogene Boundary
TLDR
Records of the global stratigraphy across this boundary are synthesized to assess the proposed causes of the Cretaceous-Paleogene boundary and conclude that the Chicxulub impact triggered the mass extinction.
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Carbon cycling and chronology of climate warming during the Palaeocene/Eocene transition
Current models of the global carbon cycle lack natural mechanisms to explain known large, transient shifts in past records of the stable carbon-isotope ratio (δ13C) of carbon reservoirs. The…
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New chronology for the late Paleocene thermal maximum and its environmental implications
The late Paleocene thermal maximum (LPTM) is associated with a brief, but intense, interval of global warming and a massive perturbation of the global carbon cycle. We have developed a new orbital…
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A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations
foraminiferal d 18 O and Mg/Ca suggests that the ratio of magnesium to calcium in the Turonian-Coniacian ocean may have been lower than in the Albian-Cenomanian ocean, perhaps coincident with an…
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Abrupt reversal in ocean overturning during the Palaeocene/Eocene warm period
TLDR
These results corroborate climate model inferences that a shift in deep-ocean circulation would deliver relatively warmer waters to the deep sea, thus producing further warming and can initiate abrupt deep-Ocean circulation changes in less than a few thousand years, but may have lasting effects.
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