Date- 26th Sept 09 Source- http://www.ciw.edu/multimedia_content 'Canadian bedrock more than four billion years old may be the oldest known section of the Earths early crust. Scientists at the Carnegie Institution used geochemical methods to obtain an age of 4.28 billion years for samples of the rock, making it 250 million years more ancient than any previously discovered rocks.' More info- http://www.ciw.edu/news/oldest_known_rocks_discovered
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