What is the Meaning & Definition of eons

As we know the study of planet Earth is certainly complex because the observation entity exactly is, in both, experts and scholars in the field they used various tools to deepen his studies and then the knowledge obtained also are particularly structured and carefully so that their knowledge and recognition to be more affordable. And in this way is that it appears the concept of eons that concerns us in this review. Because the eons are each period in which the geologists have determined to divide the history of our planet Earth. More precisely they are three.
I.e., eon is the maximum time division that exists and is used in the geological time scale, which is the only frame of reference with which humans have to represent so orderly and chronologically different events that had space in the history of the planet.
However, it is worth indicate, since it is very important for understanding because it begins or ends an eon, that this situation of start or end is determined by those important and substantial changes with regard to the evolution of living beings.
It is also important to clarify that an eon does not imply a specific number of years to be defined as such, there was never an agreement to establish it, the idea of their use is to indicate that the time involved in an eon is important.
To better understand this stratification that performs the geology for the planet we inhabit should indicate that the division that precedes the eon is the supereon, while those that continue them are the famous eras (Cenozoic, Paleozoic, Mesozoic,) among others.
And finally we must say that those three aeons are: Phanerozoic, Proterozoic and archaic. The first is characterized because in the lived macroscopic organisms such as plants, animals, fungi, among others. In the following one of the major events were the first glaciation and large movements of tectonic plates that give way to the planetary structure of today are produced in the last eon day.