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Stromatolites 3,400–3,500 Myr old from the North Pole area, Western Australia
Stromatolites are the least controversial evidence of early life; they are organosedimentary structures resulting from the growth and metabolic activity of microorganisms1. Before this report,Expand
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Air density 2.7 billion years ago limited to less than twice modern levels by fossil raindrop imprints
According to the ‘Faint Young Sun’ paradox, during the late Archaean eon a Sun approximately 20% dimmer warmed the early Earth such that it had liquid water and a clement climate. Explanations forExpand
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Isotopic evidence for biological nitrogen fixation by molybdenum-nitrogenase from 3.2 Gyr
Nitrogen is an essential nutrient for all organisms that must have been available since the origin of life. Abiotic processes including hydrothermal reduction, photochemical reactions, or lightningExpand
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Evaporitic sediments of Early Archaean age from the Warrawoona Group, North Pole, Western Australia
Chemical sediments are common and diverse in the c. 3500 Myr old North Pole chert-barite unit in the Warrawoona Group, Western Australia. Although almost all original minerals were replaced duringExpand
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Microfossil recognition in Archean rocks : an appraisal of spheroids and filaments from a 3500 M.Y. old chert-barite unit at North Pole, Western Australia
Except in exceptional circumstances, real Archean microfossils should occur in thin sections of low-grade rocks of sedimentary origin, consist of kerogen, exceed the minimum size for independentlyExpand
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Stromatolite recognition in ancient rocks: an appraisal of irregularly laminated structures in an Early Archaean chert-barite unit from North Pole, Western Australia
The word ‘stromatolite’ should only be applied to organosedimentary structures predominantly accreted by sediment trapping, binding and/or in situ precipitation as a result of the growth andExpand
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An extended organic carbon-isotope record across the Triassic–Jurassic boundary in the Queen Charlotte Islands, British Columbia, Canada
Abstract New lithologic and organic carbon-isotope data are presented for the Triassic–Jurassic boundary section at Kennecott Point, Queen Charlotte Islands, British Columbia, Canada. The previouslyExpand
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A statistical analysis of the carbon isotope record from the Archean to Phanerozoic and implications for the rise of oxygen
Organic and inorganic carbon isotope records reflect the burial of organic carbon over geological timescales. Permanent burial of organic carbon in the crust or mantle oxidizes the surfaceExpand
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Acritarchs and microfossils from the Mesoproterozoic Bangemall Group, northwestern Australia.
Three microfossil assemblages occur in the Mesoproterozoic Bangemall Group (1625-1000 Ma) of northwestern Australia, each occupying a different environmental and taphonomic setting. In peritidalExpand
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