|WikiProject Geology||(Rated Stub-class, Mid-importance)|
Definition needed 
I understand that this is only a stub of an article. The next step in its development surely must be a definition of the paleoarchaen era. By definition, I mean something like the following examples :
The paleophanerozoic is defined as the chron (time period) between the Cambrian explosion and the Permian Great Dying.
The mesophanerozoic is defined as the period of time between the Permian Great Dying and the Asteroid strike of 65 Mya.
I am not knowledgable enough to provide this needed definition. I must rely on those who have the knowledge.
Please note that the definition is not dependent on science knowing when a defining event occured, only that it occurred and is how the era is defined.