What Period of Geologic Time Did Humans First Appear?
The period of geological time in which humans first began appearing is known as the Quaternary Period. This period began approximately 1.6 million years ago. Human-like apes began showing up in the fossil record during the tail end of the Tertiary Period.
A geologic period is one of several subdivisions of geologic time enabling cross-referencing of rocks and geologic events from place to place.
These periods form elements of a hierarchy of divisions...