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Subject: Archaean Life Author: Blobrana [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 21:58:38 09/30/04 Thu Geologists working on ancient South African rocks have proved that there was life on Earth about 3.4 billion years ago and that these life forms relied on sunlight to live - a discovery that reconfirms a theory ditched by scientists in the past. The find was made by Michael Tice and Professor Donald Lowe of Stanford University in the United States. Studying fossilised micro-organisms taken from 3.8-billion-year-old sedimentary rock at Barberton in north-eastern South Africa, the geologists found evidence of early life in the rocks of structures and texture that resemble mats made from blue-green algae. "They were able to prove that during the Archaean age around 3400 million years ago there was some form of life around," Barberton is one of only two known locations worldwide of rocks formed in the shallow waters of an open ocean system more than three billion years ago. In 1987 the discovery of micro-organisms on similar rocks by Bill Schorf, an American scientist studying fossils at Pilbara in western Australia, first gave rise to the theory. "This was big news. He suggested that the micro-organisms were making oxygen and releasing it into the atmosphere." However, the theory was then discredited by another scientist, Martin Brasier, who argued these fossils were not "true" fossils and "without biological origin”. The latest findings by Tice and Lowe have now forced scientists to revert to Schorf's original analysis. "This study proves that yes, indeed there was life early one. Microbial organisms were the start of everything and developed into everything we have on earth today," The new discovery also showed that the early life forms depended on sunlight to exist. "They could also show that these organisms used the sun to get their energy and that is also very important. From photosynthesis comes oxygen" . "We are now back to believing that definitely early on there was life and the metabolic pathway of photosynthesis was in place”. [ Next Thread | Previous Thread | Next Message | Previous Message ]