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Exactly how long did the each period of the geologic time scale last?

need this before 12-20-2012

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Sorry, young fellah - you can look this up for yourself. The amount of information available is overwhelming. Even a brief summary would exceed the 1200 characters I am allowed to answer your question. At the top RH corner of this page the Editors of have left several live links that will answer your question. I followed one link and came to a single Site which is as good a place as any to start, Where I live it is already 4:15 pm on the 20th of December, so I am too late to help you anyway. But you are still living in yesterday, so you still have time to follow up on those "Popular Searches" I mentioned earlier. I usually start with Wikipedia - they have nice, short summaries - which is probably what you are looking for anyway....

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