The earliest Cambrian record of animals and ocean geochemical change

@article{Maloof2010TheEC,
  title={The earliest Cambrian record of animals and ocean geochemical change},
  author={Adam C. Maloof and Susannah M. Porter and John L. Moore and Francis Ő. Dudás and Samuel A. Bowring and John. A Higgins and David A. Fike and Michael P. Eddy},
  journal={Geological Society of America Bulletin},
  year={2010},
  volume={122},
  pages={1731-1774}
}
  • A. Maloof, S. Porter, M. Eddy
  • Published 1 November 2010
  • Environmental Science, Geography
  • Geological Society of America Bulletin
The Cambrian diversification of animals was long thought to have begun with an explosive phase at the start of the Tommotian Age. Recent stratigraphic discoveries, however, suggest that many taxa appeared in the older Nemakit-Daldynian Age, and that the diversification was more gradual. We map lowest Cambrian (Nemakit-Daldynian through Tommotian) records of δ 13 C CaCO 3 variability from Siberia, Mongolia, and China onto a Moroccan U/Pb–δ 13 C CaCO 3 age model constrained by five U/Pb ages from… 

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References

SHOWING 1-10 OF 727 REFERENCES
Constraints on early Cambrian carbon cycling from the duration of the Nemakit-Daldynian–Tommotian boundary δ13C shift, Morocco
The Nemakit-Daldynian–Tommotian (ND-T) boundary marks the first appearance of metazoan reefs and calcite biomineralizers and is associated with the largest δ 13 C shift during the Phanerozoic Eon.
The Sr isotopic evolution of the oceans during the 'Cambrian Explosion'
  • C. Nicholas
  • Environmental Science, Geography
    Journal of the Geological Society
  • 1996
The Late Precambrian and Cambrian were periods of marked global change in the biosphere with the appearance and rapid radiation of skeletalized metazoans. However, the changes in atmosphere and
Carbon-isotope events across the Precambrian/Cambrian boundary on the Siberian Platform
Variations of marine isotopes with time have been observed through the Phanerozoic1,2, in association with some period boundaries: Pleistocene/Holocene3, Cretaceous/Tertiary4, Permo-Triassic5,6 and
Fossil steroids record the appearance of Demospongiae during the Cryogenian period
TLDR
It is suggested that shallow shelf waters in some late Cryogenian ocean basins contained dissolved oxygen in concentrations sufficient to support basal metazoan life at least 100 Myr before the rapid diversification of bilaterians during the Cambrian explosion.
Fossil evidence for the location of the Precambrian/Cambrian boundary in Morocco
THE Precambrian/Cambrian boundary is one of the most important points of the geological rimescale, yet it remains stratigraphi-cally undefined1. Most of the candidate sections are in carbonate
An expanded record of Early Cambrian carbon cycling from the Anti-Atlas Margin, Morocco
We present a δ13C record from the Anti-Atlas mountains of Morocco and place it in the context of a detailed regional tectonostratigraphy. We place the litho- and chemostratigraphic record in a
Multiple δ13C excursions spanning the Cambrian explosion to the Botomian crisis in Siberia
New high-resolution δ 13 C data through the Lower Cambrian of Siberia reveal multiple, positive excursions coincident with phases in the "explosion" of invertebrate phyla (Nemakit-Daldynian to middle
Pulsed oxidation and biological evolution in the Ediacaran Doushantuo Formation
TLDR
High-resolution geochemical data from the fossil-rich Doushantuo Formation in South China are reported that confirm trends from other broadly equivalent sections and highlight key features that have not been observed in most sections or have received little attention.
The Precambrian-Cambrian boundary: Magnetostratigraphy and Carbon Isotopes resolve correlation problems between Siberia, Morocco, and South China
Late Proterozoic and Early Cambrian age platform carbonates from the Siberian platform now have the most complete records of paleontological, magnetostratigraphic, and δ^(13)C variations preserved
...
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