But how may we separate the Proterozoic rocks from the Archeozoic?
Archeozoic , the era in which the simplest forms of life originated.
Even in the Archeozoic the rocks testify to a climate seemingly not greatly different from that of the average of geologic time.
Archeozoic rocks have been studied minutely over a very small percentage of the earth's land surface.
It has been estimated that Archeozoic rocks appear at the surface over about one-fifth of the land area of the earth.
Thus, igneous rocks distinctly predominate in the Archeozoic, while stratified rocks predominate in the Proterozoic.
I believe that our sun could not have been a typical nova, at least not since the Archeozoic, that is for perhaps a billion years.
Do the most ancient known rocks show that animal life existed during Archeozoic time?
During the Archeozoic, no evidence of glaciation has yet been discovered.
The early and middle Proterozoic strata throw no more light upon the early history of animal life than do the Archeozoic strata.
|Archeozoic also Archaeozoic |