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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…
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…
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…
Formation of the Isthmus of Panama
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.
Warm tropical ocean surface and global anoxia during the mid-Cretaceous period
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.
The Chicxulub Asteroid Impact and Mass Extinction at the Cretaceous-Paleogene Boundary
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.
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…
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…
A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations
- K. Bice, D. Birgel, P. Meyers, K. Dahl, K. Hinrichs, R. Norris
- Environmental Science, Geography
- 1 June 2006
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…
Abrupt reversal in ocean overturning during the Palaeocene/Eocene warm period
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.