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Archean life in the Barberton Greenstone Belt
The Barberton Greenstone Belt of eastern South Africa contains some of the most widely accepted fossil evidence for Archean life. These cell-sized prokaryote fossils are seen in the Barberton fossil record in rocks as old as 3.5 billion years. The Barberton Greenstone Belt is an excellent place to study the Archean Earth due to exposed sedimentary and metasedimentary rocks.
Studying the earliest forms of life on Earth can provide valuable information to help understand how life can evolve on other planets. It has long been hypothesized that life may have existed on Mars due to the similarity of environmental and tectonic conditions during the Archean time. By knowing the environments in which early life evolved on Earth, and the rock types that preserve them, scientists can have a better understanding of where to look for life on Mars.
==Global beginnings of life==
Fossil life of 3.5 billion years of age is also found in the Pilbara craton of western Australia. This evidence, along with Barberton fossils, show that cellular life must have existed by this point in the evolution of Earth. There is work that potentially demonstrates life at 3.8 billion years ago, in what is now western Greenland, but it is highly debated. It is important to note that cellular life existed 3.5 billion years ago and thus it evolved prior to this time. Because the Earth is 4.5 billion years old, there is a window of about one billion years for cellular life to evolve from a lifeless earth.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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