Labels:book | bulletin board | reckoner OCR: record of early life can be read in their rocks The testimony however is not extensive Geologic activity. including plate tectonics erosion and metamorphism has destroyed almost all the ancient rocks Very few fragments have survived this geologic machine Nevertheless in recent years several important finds have been made again using isotope geochemistry One group led by Stephen Moorbath of the University of Oxford discovered terrain in West Greenland that is between 3.7 and 3.8 billion years old in addition, Samuel A Bowring of the Massachusetts Institute of Technology explored small area in North America the Acasta gneiss that is 3.96 billion years old Ultimately quest for the mineral zircon led other researchers to even more ancient terrain Typically found in continental rocks zircon is ...
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