Biomarker Evidence for Photosynthesis During Neoproterozoic Glaciation

@article{Olcott2005BiomarkerEF,
  title={Biomarker Evidence for Photosynthesis During Neoproterozoic Glaciation},
  author={Alison N. Olcott and Alex L. Sessions and Frank A. Corsetti and Alan J Kaufman and Tolentino Flavio de Oliviera},
  journal={Science},
  year={2005},
  volume={310},
  pages={471 - 474}
}
Laterally extensive black shales were deposited on the São Francisco craton in southeastern Brazil during low-latitude Neoproterozoic glaciation ∼740 to 700 million years ago. These rocks contain up to 3.0 weight % organic carbon, which we interpret as representing the preserved record of abundant marine primary productivity from glacial times. Extractable biomarkers reflect a complex and productive microbial ecosystem, including both phototrophic bacteria and eukaryotes, living in a… 

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References

SHOWING 1-10 OF 66 REFERENCES

A neoproterozoic snowball earth

Negative carbon isotope anomalies in carbonate rocks bracketing Neoproterozoic glacial deposits in Namibia, combined with estimates of thermal subsidence history, suggest that biological productivity

Perennial Antarctic lake ice: an oasis for life in a polar desert.

The permanent ice covers of Antarctic lakes in the McMurdo Dry Valleys develop liquid water inclusions in response to solar heating of internal aeolian-derived sediments for the establishment of a physiologically and ecologically complex microbial consortium capable of contemporaneous photosynthesis, nitrogen fixation, and decomposition.

A complex microbiota from snowball Earth times: Microfossils from the Neoproterozoic Kingston Peak Formation, Death Valley, USA

Microfossil evidence of a once-thriving prokaryotic and eukaryotic microbial community preserved in chert and carbonate of the Neoproterozoic Kingston Peak Formation indicates that microbial life adapted to shallow-water carbonate environments did not suffer the significant extinction postulated for this phase of low-latitude glaciation and that trophic complexity survived through snowball Earth times.

Photic Zone Euxinia During the Permian-Triassic Superanoxic Event

The authors' evidence for widespread photiczone euxinic conditions suggests that sulfide toxicity was a driver of the extinction and a factor in the protracted recovery of the Permian-Triassic superanoxic event.

Carbon isotopic composition of Neoproterozoic glacial carbonates as a test of paleoceanographic models for snowball Earth phenomena

Consistently positive carbon isotopic values were obtained from in situ peloids, ooids, and stromatolitic carbonate within Neoproterozoic glacial successions in northern Namibia, central Australia,

Isotopes, ice ages, and terminal Proterozoic earth history.

Detailed correlations of ancient glacial deposits, based on temporal records of carbon and strontium isotopes in seawater, indicate four (and perhaps five) discrete ice ages in the terminal

The Marinoan glaciation (Neoproterozoic) in northeast Svalbard

Two separate and distinct diamictite‐rich units occur in the mixed carbonate‐siliciclastic Polarisbreen Group, which comprises the top kilometer of >7 km of Neoproterozoic strata in the northeast of
...