Natalian

The Natalian Period is the third period recognized in the Geologic Timescale. Its name refers to "birth", as the first life forms are suspected to have evolved from nonliving organic matter around this period of 500 million years. These first organisms were probably consumers, feeding on the 'primordial soup' of free-floating proteins and nutrients in the warm waters of far-ancient Rathnir. It is defined not by any particular rock formations but by age, as is the succeeding Transplutolithic Period- hence its duration being exactly between 3.5 to 4.0 Ga.