Cretaceous

Ogg, James G.; Ogg, Gabi M.; Gradstein, Felix M.

doi:10.1016/b978-0-444-59467-9.00013-3

Cited by 49 publications

(87 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Scott et al (2009) suggested that these ages may be too young due to argon leakage, a problem in glauconites, and Fiet et al (2006) recognized that they require testing with studies on bentonites. By contrast, Huang et al (2010), also using cyclostratigraphy, obtained ages for the Aptian and Albian very close to those of Ogg and Hinnov (2012) and suggested that the shorter durations of Fiet et al (2006) were due to incompleteness of the sections studied. The dates of Ogg and Hinnov (2012) still involve considerable extrapolation, but use of this single comprehensive scheme should make correction of the calibrations presented here easier if this becomes necessary in the future.…”

Section: Fossil Taxonmentioning

confidence: 79%

“…Node Minimum Age 4 minimum ages that correspond to stage boundaries are the point estimates of Ogg and Hinnov (2012) minus the associated two standard deviations. Many radiometric dates are available for the Late Cretaceous, thanks particularly to the abundance of bentonites.…”

Section: Fossil Taxonmentioning

confidence: 99%

“…Absolute ages used here follow Ogg and Hinnov (2012). This chapter of the revised Geologic Time Scale of Gradstein (2012) is the most recent comprehensive synthesis of absolute dates for the Cretaceous, including estimated ages for each substage, which we derive here from the charts in figure 27.6 of Ogg and Hinnov (2012).…”

Section: Introductionmentioning

confidence: 99%

“…This chapter of the revised Geologic Time Scale of Gradstein (2012) is the most recent comprehensive synthesis of absolute dates for the Cretaceous, including estimated ages for each substage, which we derive here from the charts in figure 27.6 of Ogg and Hinnov (2012). When possible, use of substage boundaries is preferable to the use of stage boundaries only, which can be overly conservative when dealing with stages as long as the Albian (ca.…”

Section: Introductionmentioning

confidence: 99%

“…12.5 Ma). In their table 27.2, Ogg and Hinnov (2012) included the estimated uncertainty for the boundaries of stages (2-sigma), but not for the boundaries of substages. In order to be conservative and to take into account existing estimates of uncertainty, those of our recommended TABLE 1.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fossil calibration of Magnoliidae, an ancient lineage of angiosperms

Massoni

Doyle

Sauquet

2015

Palaeontologia Electronica

View full text Add to dashboard Cite

Section: Fossil Taxonmentioning

confidence: 79%

Section: Fossil Taxonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fossil calibration of Magnoliidae, an ancient lineage of angiosperms

Massoni

Doyle

Sauquet

2015

Palaeontologia Electronica

View full text Add to dashboard Cite

Upper ocean oxygenation dynamics from I/Ca ratios during the Cenomanian‐Turonian OAE 2

et al. 2015

View full text Add to dashboard Cite

Global warming lowers the solubility of gases in the ocean and drives an enhanced hydrological cycle with increased nutrient loads delivered to the oceans, leading to increases in organic production, the degradation of which causes a further decrease in dissolved oxygen. In extreme cases in the geological past, this trajectory has led to catastrophic marine oxygen depletion during the so-called oceanic anoxic events (OAEs). How the water column oscillated between generally oxic conditions and local/global anoxia remains a challenging question, exacerbated by a lack of sensitive redox proxies, especially for the suboxic window. To address this problem, we use bulk carbonate I/Ca to reconstruct subtle redox changes in the upper ocean water column at seven sites recording the Cretaceous OAE 2. In general, I/Ca ratios were relatively low preceding and during the OAE interval, indicating deep suboxic or anoxic waters exchanging directly with near-surface waters. However, individual sites display a wide range of initial values and excursions in I/Ca through the OAE interval, reflecting the importance of local controls and suggesting a high spatial variability in redox state. Both I/Ca and an Earth System Model suggest that the northeast proto-Atlantic had notably higher oxygen levels in the upper water column than the rest of the North Atlantic, indicating that anoxia was not global during OAE 2 and that important regional differences in redox conditions existed. A lack of correlation with calcium, lithium, and carbon isotope records suggests that neither enhanced global weathering nor carbon burial was a dominant control on the I/Ca proxy during OAE 2.

show abstract

Late Aptian (Cretaceous) paleoceanography of the South Atlantic Ocean inferred from dinocyst communities of the Sergipe Basin, Brazil

2016

View full text Add to dashboard Cite

The late Aptian (Early Cretaceous) is a crucial time interval for understanding the paleoceanographic changes in the Southern Hemisphere. Oceanographic changes in the emerging South Atlantic Ocean during this interval are reflected in the stratigraphic distribution of dinoflagellate communities recorded in the Muribeca and Riachuelo formations of the Sergipe Basin in northeastern Brazil. The Subtilisphaera community, in the lower and middle parts of the section, appears to be related to the Subtilisphaera Ecozone and suggests the onset of Tethyan influence in the central South Atlantic, in a restricted to inner-neritic environment. The succeeding Spiniferites community, in the middle part of the section, represents the first significant transgression, probably of eustatic origin. The Cyclonephelium-Exochosphaeridium community, in the upper part of the section, appears to be related to an oceanic event characterized by intermittent dysoxic-anoxic conditions. The uppermost part of the section is dominated by the Spiniferites community, related to a progressive regional transgression and culminating in an open-marine, fully Tethyan environment in the central part of the widening South Atlantic.

show abstract

Cretaceous

Cited by 49 publications

References 50 publications

Fossil calibration of Magnoliidae, an ancient lineage of angiosperms

Fossil calibration of Magnoliidae, an ancient lineage of angiosperms

Upper ocean oxygenation dynamics from I/Ca ratios during the Cenomanian‐Turonian OAE 2

Late Aptian (Cretaceous) paleoceanography of the South Atlantic Ocean inferred from dinocyst communities of the Sergipe Basin, Brazil

Contact Info

Product

Resources

About