Introduction to the Archaean ... If you were able to travel back to visit the Earth during the Archaean, you would likely not recognize it is the same planet we inhabit today. The atmosphere was very different from what we breathe today;
www.ucmp.berkeley.edu/precambrian/archaean.html www.ucmp.berkeley.edu/precambrian/archaean.html
The Geological Time-Scale for the Archean Era ... In fact, the "age of the oldest preserved rocks on Earth's surface" has been formally proposed as a definition for the base of the Archaean. Most of the oldest rocks are so altered through subsequent metamorphic processes it is difficult to ... Introduction to the Archaean Era...
www.palaeos.com/Archean/Archean.htm www.palaeos.com/Archean/Archean.htm
A brief description of the Archeon Era. ... Peripatus Home Page Paleontology Page >> Archean Era ... This deep environment would have provided the microbiota with protection from the harmful UV radiation prevalent at the surface of the Earth during the Archaean, when there was no protective ozone layer" (Brack 2002).
www.peripatus.gen.nz/Paleontology/Archaean.html www.peripatus.gen.nz/Paleontology/Archaean.html
Archean Earth differed greatly from our modern Earth not only in tectonic activity but also with respect to atmosphere and obviously life forms. The Archean atmosphere was enriched in carbon oxides, water vapor, nitrous oxides, ... The Archean is known as the "Age of Prokaryotes", ... Why are Cyanobacteria important?
www.uwsp.edu/geo/faculty/hefferan/Geol106/CLASS3/ARCHEA... www.uwsp.edu/geo/faculty/hefferan/Geol106/CLASS3/ARCHEAN%20LIFE.htm
Top of page ... NEWS AND VIEWSArchaean stromatolites and the search for the earliest life ... A new microfossil assemblage from the Archaean of Western Australia...
www.nature.com/nature/journal/v441/n7094/abs/nature0476... www.nature.com/nature/journal/v441/n7094/abs/nature04764.html
During the Archaean era (before 2.5 Gyr ago), methanogens may have been important in regulating climate, because they could have provided sufficient amounts of the greenhouse gas methane to mitigate a severely frozen condition that could have resulted from lower solar luminosity2 during these times.
www.nature.com/nature/journal/v440/n7083/abs/nature0458... www.nature.com/nature/journal/v440/n7083/abs/nature04584.html
While the Cambrian Period with its explosion of life generally marks the beginning of the Paleozoic Era and life on our planet, there are many indications that the preparation for life ... For more on geologic time go to the clock of eras page; Click here to see hadean time ; Following the Archaean Era is the Proterozoic...
www.fossils-facts-and-finds.com/archaean.html www.fossils-facts-and-finds.com/archaean.html
In the Archaean Era, Earth had an atmosphere of methane and ammonia. This is also when continental plates began to form. Life makes its first appearance during the Archaean as well, although it is all bacterial. The oldest fossils come from this time (around 3.5 billion years ago).
www.angelfire.com/in/kbrian1/archaean.htm www.angelfire.com/in/kbrian1/archaean.htm
Both life and geological processes get their start in the Archaean era amidst a brew of atmospheric gases that probably includes methane and ammonia but little or no free oxygen. As Earth cools, a crust forms over it.
www.pbs.org/wgbh/evolution/change/deeptime/archaean.htm... www.pbs.org/wgbh/evolution/change/deeptime/archaean.html
To read this story in full you will need to login or make a payment (see right). ... Letters to Nature ... Open Innovation Challenges...
www.npg.nature.com/nature/journal/v410/n6824/full/41007... www.npg.nature.com/nature/journal/v410/n6824/full/410077a0.html