Labels:bulletin board | reckoner OCR: 4.3 billion years oid Zircons have been crucial not only for understanding the age of the continents but for determining when life first appeared The earliest fossils of undisputed age were found in Australia and South Africa These relics of blue- -green algae are about 35 billion years Manfred Schidlowski of the Max Planck Institute for Chemistry in Mainz has studied the Isua formation in West Greenland and argues that organic matter existed as many as 3.8 billion years ago Because most of the record of early life has been destroyed by geologic activity. we cannot say exactly when it first appeared perhaps itarose very quickly, maybe even 4.2 billion years ago One of the most important aspects of the earth's evolution is the formation of the atmosphere because it is this assemblage of gas ...
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