How Long Is an Epoch?

Answer

An epoch is not actually a set time period. It is basically just a unit of geological time that was marked by a certain distinction or characteristic due to a fixed point or event. Therefore, the event itself would determine the length of that particular epoch.
1 Additional Answer
An epoch is a grouping of many events into a time period that can define them. Its duration is always longer than an era, but always shorter than an age - geologically speaking.
Q&A Related to "How Long Is an Epoch"
An epoch is a noteworthy or memorable period of history, or marks the beginning of that period of history. And it can be an instance in time, that is created as a point of reference
http://answers.ask.com/Science/Nature/what_is_an_e...
Epoch, the geologic time period which is shorter than period but longer than an age.
http://wiki.answers.com/Q/What_are_epochs
1. Determine the number of years since 1970 and multiply that by the approximate number of seconds in a year, which is 31,556,926 seconds. For example, if the current year is 2011
http://www.ehow.com/how_8587442_calculate-epoch.ht...
The subdivisions of the units of geological time known as periods. Thus, the Pleistocene epoch is part of the Quaternary period.
http://www.answers.com/topic/epochs
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