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The first life on Earth left only weak traces, mainly in the form of sediments formed by biological activity. In September 2016, a research team from the University of Wollongong, New South Wales, published an article in which it announced the discovery of alleged stromatolites aged 3.7 billion years in the Isua training in Greenland.
Conical structures in the formation of Isua, Greenland.NUTMAN et al. 2016
Stromatolites were first described in 1908 by the German mineralogist Ernst Kalkowski as regularly stratified sedimentary structures. He explained them as fossilized microbial mats. Still today, various species of bacteria and algae secrete mucus to form a sticky microbial mat, which eventually gets covered with fine sand, carried by waves or currents. To survive, bacteria and algae grow through the grain layer, recolonizing the surface. If this occurs repeatedly, a layered dome, cone or column will form.
The structures found in Greenland are almost 200 million years older than the oldest and oldest fossils of microbes found in Australia. They formed only 300 to 100 million years after the conditions on the Primitive Earth became favorable to life. Unfortunately, the metamorphic rocks of the Isua Formation have not preserved the finer details. There is therefore no direct evidence of the presence of cellular structures. According to the scientists, the isotope distribution suggests that stratified rocks formed permanently under water and are sedimentary rocks of origin. The presence of mineral dolomite might suggest that microbial activity has been implicated in the formation of Isua formation. Dolomite is a mineral that can form during the evaporation of seawater. Microbes significantly accelerate the precipitation of dolomite crystals and it is thought that most dolomites in the history of the Earth formed through microbial activity. The most convincing proof, according to scientists, is the strange form of the structures studied. The structures in stratified rocks have a cone-shaped section, similar to the true stromatolites found in Australian rocks of 3.4 to 2 billion years old.
A research team from the Pasadena Jet Propulsion Laboratory revisited the outcrop and rerun the so-called fossils. Using X-ray mapping technology also used to study the chemical composition of rocks on Mars, the team reconstructed the shape of the structures inside the rocks. The new results, now published, suggest that structures have a much more irregular shape as we believe. According to the JPL team, the structures rearrange more elongated folds in the form of cones and unlike the true stromatolites, the structures have no internal and regular overlap. They conclude that Isua formation structures were formed by tectonic deformation of the rocks and are not of biological origin.
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The first life on Earth left only weak traces, mainly in the form of sediments formed by biological activity. In September 2016, a research team from the University of Wollongong, New South Wales, published an article in which it announced the discovery of alleged stromatolites aged 3.7 billion years in the Isua training in Greenland.
Conical structures in the formation of Isua, Greenland.NUTMAN et al. 2016
Stromatolites were first described in 1908 by the German mineralogist Ernst Kalkowski as regularly stratified sedimentary structures. He explained them as fossilized microbial mats. Still today, various species of bacteria and algae secrete mucus to form a sticky microbial mat, which eventually gets covered with fine sand, carried by waves or currents. To survive, bacteria and algae grow through the grain layer, recolonizing the surface. If this occurs repeatedly, a layered dome, cone or column will form.
The structures found in Greenland are almost 200 million years older than the oldest and oldest fossils of microbes found in Australia. They formed only 300 to 100 million years after the conditions on the Primitive Earth became favorable to life. Unfortunately, the metamorphic rocks of the Isua Formation have not preserved the finer details. There is therefore no direct evidence of the presence of cellular structures. According to the scientists, the isotope distribution suggests that stratified rocks formed permanently under water and are sedimentary rocks of origin. The presence of mineral dolomite might suggest that microbial activity has been implicated in the formation of Isua formation. Dolomite is a mineral that can form during the evaporation of seawater. Microbes significantly accelerate the precipitation of dolomite crystals and it is thought that most dolomites in the history of the Earth formed through microbial activity. The most convincing proof, according to scientists, is the strange form of the structures studied. The structures in stratified rocks have a cone-shaped section, similar to the true stromatolites found in Australian rocks of 3.4 to 2 billion years old.
A research team from the Pasadena Jet Propulsion Laboratory revisited the outcrop and rerun the so-called fossils. Using X-ray mapping technology also used to study the chemical composition of rocks on Mars, the team reconstructed the shape of the structures inside the rocks. The new results, now published, suggest that structures have a much more irregular shape as we believe. According to the JPL team, the structures rearrange more elongated folds in the form of cones and unlike the true stromatolites, the structures have no internal and regular overlap. They conclude that Isua formation structures were formed by tectonic deformation of the rocks and are not of biological origin.
