Changes

'''Eon, aeon:''' the longest division of [[Geology|geologic]] time, geological time; a geological age; the time of the physical formation and development of the earth (especially prior to human [[history]]); also, the largest division of geologic time, defined as a unit of geological time equal to a billion years.  

'''Eon, aeon:''' the longest division of [[Geology|geologic]] time, geological time; a geological age; the time of the physical formation and development of the earth (especially prior to human [[history]]); also, the largest division of geologic time, defined as a unit of geological time equal to a billion years.  

'''Age'''; a very large division of geologic time usually longer than an era; a major division of geological time, subdivided into eras, comprising two or more eras; a geological era, such as "the Precambrian eon"; an era is usually divided into two or more periods, "the Triassic, the Jurassic, the Tertiary".

'''Age'''; a very large division of geologic time usually longer than an era; a major division of geological time, subdivided into eras, comprising two or more eras; a geological era, such as "the Precambrian eon", "the Cenozoic era"; an era is usually divided into two or more periods, "the Triassic, the Jurassic, the Tertiary (relating to or denoting the first period of the Cenozoic era, between the Cretaceous and Quaternary periods, and comprising the Paleogene and Neogene subperiods)".

==philosophy==

==philosophy==