Evidence of Archean life: Stromatolites and microfossils
نویسندگان
چکیده
Evidence of Archean life: Stromatolites and microfossils J. William Schopf a,∗, Anatoliy B. Kudryavtsev b, Andrew D. Czaja c, Abhishek B. Tripathi c a Department of Earth and Space Sciences, Center for the Study of Evolution and the Origin of Life (Institute of Geophysics and Planetary Physics), Molecular Biology Institute, and NASA Astrobiology Institute, University of California, Los Angeles, CA 90095, USA b Center for the Study of Evolution and the Origin of Life (Institute of Geophysics and Planetary Physics, and NASA Astrobiology Institute), University of California, Los Angeles, CA 90095, USA c Department of Earth and Space Sciences, Center for the Study of Evolution and the Origin of Life (Institute of Geophysics and Planetary Physics), University of California, Los Angeles, CA 90095, USA
منابع مشابه
Carbonaceous Filaments from North Pole, Western Australia: Are They Fossil Bacteria in Archean Stromatolites? a Discussion
Some time ago Buick (1984) cast doubt on both the biogenicity and the age of the objects we described as Early Archean bacterial microfossils in a previous paper (Awramik et al., 1983). He presented new evidence significant to the interpretation of these objects, but his report also contains statements that may be misleading. We wish to comment on his new evidence and to correct the misleading ...
متن کاملLife: the first two billion years.
Microfossils, stromatolites, preserved lipids and biologically informative isotopic ratios provide a substantial record of bacterial diversity and biogeochemical cycles in Proterozoic (2500-541 Ma) oceans that can be interpreted, at least broadly, in terms of present-day organisms and metabolic processes. Archean (more than 2500 Ma) sedimentary rocks add at least a billion years to the recorded...
متن کاملMicrofossils of the Early Archean Apex chert: new evidence of the antiquity of life.
Eleven taxa (including eight heretofore undescribed species) of cellularly preserved filamentous microbes, among the oldest fossils known, have been discovered in a bedded chert unit of the Early Archean Apex Basalt of northwestern Western Australia. This prokaryotic assemblage establishes that trichomic cyanobacterium-like microorganisms were extant and morphologically diverse at least as earl...
متن کاملPaleobiological Perspectives on Early Microbial Evolution.
Microfossils, stromatolites, and chemical biosignatures indicate that Earth became a biological planet more than 3.5 billion years ago, making most of life's history microbial. Proterozoic rocks preserve a rich record of cyanobacteria, including derived forms that differentiate multiple cell types. Stromatolites, in turn, show that microbial communities covered the seafloor from tidal flats to ...
متن کاملPellet microfossils: Possible evidence for metazoan life in Early Proterozoic time.
Microfossils resembling fecal pellets occur in acid-resistant residues and thin sections of Middle Cambrian to Early Proterozoic shale. The cylindrical microfossils average 50 x 110 mum and are the size and shape of fecal pellets produced by microscopic animals today. Pellets occur in dark gray and black rocks that were deposited in the facies that also preserves sulfide minerals and that repre...
متن کامل