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period of time

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whatever | 18:57 Thu 15th Apr 2004 | People & Places
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in geology what word denotes a period of 1,000,000,000 years
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An eon.
It's normally spelt "aeon".
There is no geological protocol to denote a period of 1 billion years. The largest sections of geological time are named eras. then periods, aeons, and finally stages. there are some other sub-sections, but The Geological Journal of London uses these.

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