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Archean molecular fossils and the early rise of eukaryotes.
The presence of steranes, particularly cholestane and its 28- to 30-carbon analogs, provides persuasive evidence for the existence of eukaryotes 500 million to 1 billion years before the extant fossil record indicates that the lineage arose.
2-Methylhopanoids as biomarkers for cyanobacterial oxygenic photosynthesis
It is shown that 2-methylbacteriohopanepolyols occur in a high proportion of cultured cyanob bacteria and cyanobacterial mats and are abundant in organic-rich sediments as old as 2,500 Myr, which may help constrain the age of the oldest cyanobacteria and the advent of oxygenic photosynthesis.
Biomarker evidence for green and purple sulphur bacteria in a stratified Palaeoproterozoic sea
- J. Brocks, G. Love, R. Summons, A. Knoll, G. Logan, S. Bowden
- Environmental Science, GeographyNature
- 6 October 2005
Hydrocarbon biomarkers from a 1.64-Gyr-old basin in northern Australia reveal a marine basin with anoxic, sulphidic, sulphate-poor and permanently stratified deep waters, hostile to eukaryotic algae, and support mounting evidence for a long-lasting Proterozoic world in which oxygen levels remained well below modern levels.
A reconstruction of Archean biological diversity based on molecular fossils from the 2.78 to 2.45 billion-year-old Mount Bruce Supergroup, Hamersley Basin, Western Australia
Barite, BIFs and bugs: evidence for the evolution of the Earth’s early hydrosphere
Antarctic deglacial pattern in a 30 kyr record of sea surface temperature offshore South Australia
Comparison of ice cores from Greenland and Antarctica shows an asynchronous two‐step warming at these high latitudes during the Last Termination. However, the question whether this asynchrony extends…
Composition and syngeneity of molecular fossils from the 2.78 to 2.45 billion-year-old Mount Bruce Supergroup, Pilbara Craton, Western Australia
Terminal Proterozoic reorganization of biogeochemical cycles
It is shown that hydrocarbons extracted from Proterozoic sediments in several locations worldwide are derived mainly from bacteria or other heterotrophs rather than from photosyn-thetic organisms, and that preservation of algal-lipid skeletons improves at the beginning of the Cambrian, reflecting the increase in transport by rapidly sinking faecal pellets.
Formation of sphalerite (ZnS) deposits in natural biofilms of sulfate-reducing bacteria.
These results show how microbes control metal concentrations in groundwater- and wetland-based remediation systems and suggest biological routes for formation of some low-temperature ZnS deposits.