An eon is one billion years. The geologists are mistaken. They've confused the unit of time with their time-interval labels. If you'd asked "How long is a month?" then someone might have answered 29.5 days, which is correct because that's the duration of the lunar phase cycle.
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answers.yahoo.com/question/index?qid=20091023185937AATd...
answers.yahoo.com/question/index?qid=20091023185937AATdcJD
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Use eon in a Sentence ... See web results for eon ... Astronomy. one billion years.
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dictionary.reference.com/browse/eon
dictionary.reference.com/browse/eon
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219, 765 (1968)]). Deriving etymologically from ‘life’, eon, in the form of the current eon (the Phanerozoic, lasting about 570 million years), encompassed the whole fossil record when it was introduced. Preceding time was lumped together as the undifferentiated lifeless ‘pre-Cambrian’ eon of 4 billion years.
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www.answers.com/topic/eon
www.answers.com/topic/eon
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Definition to the various units of subdivision of geological time ... However, owing to the huge duration of the former, there is a tendency now to elevate the former Precambrian eras such as the Archean (previously Archeozoic) and the Proterozoic into eons. "Eon" also means any span of one billion years.
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www.palaeos.com/Timescale/timeunits.html
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"In India, the number of years assigned to an eon (A 'Great Cycle' Mahayuga of cosmic time) is 4,320,000; ... It was concluded the collison occurred about 30 million to 50 million years after the solar system was formed. That's just a blip compared to the 4.5 billion years the Earth and solar system have existed.
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www.mazzaroth.com/ChapterOne/TheAgeOfTheEarth.htm
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GEOLOGIC EONS, ERAS and PERIODS - Dinosaur glossary explains basic paleontological terms. ... Two or more Eras form an Eon, the largest division of geologic time. Some periods are divided into epochs. The major periods in the geologic history of the Earth are (mya=million years ago):
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www.enchantedlearning.com/subjects/dinosaurs/glossary/P...
www.enchantedlearning.com/subjects/dinosaurs/glossary/Period.html
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3.8 to 2.5 billion years ago ... Our oldest fossils date to roughly 3.5 billion years ago, and consist of bacteria microfossils. In fact, all life during the more than one billion years of the Archaean was bacterial. At right is an artist's depiction of what an Archaean coast might have looked like 3.5 billion years ago.
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www.ucmp.berkeley.edu/precambrian/archaean.html
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4.5 to 3.8 billion years ago ... The oldest meteorites and lunar rocks are about 4.5 billion years old, but the oldest Earth rocks currently known are 3.8 billion years old. Sometime during the first 800 million or so years of its history, the surface of the Earth changed from liquid to solid.
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www.ucmp.berkeley.edu/precambrian/hadean.html
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The Precambrian Eon; The name means: "before the Cambrian period." This old, but still common term was originally used to refer to the whole period of Earth's history before the formation of the oldest rocks ... This era begins about 4.6 billion years ago with the formation of Earth from dust and gas orbiting the Sun.
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www.cotf.edu/ete/modules/msese/earthsysflr/cambrian.htm...
www.cotf.edu/ete/modules/msese/earthsysflr/cambrian.html
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