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A biosignature (sometimes called chemical fossil or molecular fossil) is any substance – such as an element, isotope, molecule, or phenomenon – that provides...

an informal unit of geologic time, subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale. It spans from the formation of...

Astrobiology: Records of Life on Earth and the Search for Extraterrestrial Biosignatures. Cellular Origin, Life in Extreme Habitats and Astrobiology. Vol. 12...

environments in the Solar System and beyond, the search for planetary biosignatures of past or present extraterrestrial life, and the study of the origin...

estimated to have occurred between 3.5 and 2.4 billion years ago during the Archean eon, prior to the Great Oxygenation Event and Huronian glaciation. Retinal-containing...

telescopic investigations and deployed probes, searching for water, chemical biosignatures in the soil and rocks at the planet's surface, and biomarker gases in...

environmental changes makes them helpful when reconstructing past environments. Biosignature Biostratigraphy Chemostratigraphy Gunflint microfossils Macrofossil Protists...

at Pennsylvania State University where her dissertation topic was "Late Archean microbial ecology: an integration of molecular isotopic, and lithologic...

widely in the fossil record of the Precambrian but are rare today. Very few Archean stromatolites contain fossilized microbes, but fossilized microbes are...

fossils. Some fossils are biochemical and are called chemofossils or biosignatures. Gathering fossils dates at least to the beginning of recorded history...

structures (MISS); microfossils; microbial mat fabrics; and biosignatures. These fossils and biosignatures are preserved within hydrothermal dikes, barite mounds...

of purple retinal pigments on Earth and implications for exoplanet biosignatures". International Journal of Astrobiology. 20 (3): 241–250. arXiv:1810...

with a correspondingly larger original volume. This volume overlies the Archean age Indian Shield, which is likely the lithology the province passed through...

scientist at NASA Goddard Space Flight Center, who specializes in exoplanets, Archean geochemistry, planetary atmospheres, and astrobiology. Domagal-Goldman...

embedded in the carbonate. If found on Earth it would be a very strong biosignature. However, in 2001, scientists were able to explain and produce carbonate...

traces. The rock record is far from perfect, and the preservation of biosignatures is a rare occurrence. Understanding what factors determine the extent...

Rare Earth criteria: surface water, tectonic plates, a large moon and biosignatures are currently undetectable. Though planets the size of Earth are difficult...

Astrobiology: Records of Life on Earth and the Search for Extraterrestrial Biosignatures. Cellular Origin, Life in Extreme Habitats and Astrobiology. Vol. 12...

increase in the value of the δ34S in the remaining sulfate in the seawater. Archean pyrite found in barite in the Warrawoona Group, Western Australia, with...

2016, Strategies for Searching for Biosignatures in Ancient Martian Sub-Aerial Surface Environments: Biosignature Preservation and Detection in Mars Analog...