The Human Time Scale is the portion of the pedogenic time scale that covers periods of centuries, decades, or less. ... The study provides improved molecular estimates for human evolutionary events. The last major gene flow event between Africans and non-Africans.

What is the difference between human time and geologic time?

Geological time is on a different scale from human time. The earth is estimated to be 4.6 billion years old and life is thought to have become dominant on Earth 542 million years ago. The first humans existed around 2 million years ago.

What is a large time scale?

Eons are the largest intervals of geologic time and are hundreds of millions of years in duration. In the time scale above you can see the Phanerozoic Eon is the most recent eon and began more than 500 million years ago. Eons are divided into smaller time intervals known as eras.