BY LETTER
Era
[1] Two or more geological periods. An era may be hundreds of millions of years in duration, and is defined by particular geological or biological processes.
[2] An extended historical, or even galactic, period of time, that is characterized by particular historical, astronomical, or even cosmological events.
[2] An extended historical, or even galactic, period of time, that is characterized by particular historical, astronomical, or even cosmological events.
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Development Notes
Text by M. Alan Kazlev
Initially published on 24 October 2001.
Initially published on 24 October 2001.
