Online College Courses for Credit

3 Tutorials that teach Proterozoic Age
Take your pick:
Proterozoic Age

Proterozoic Age

Author: Nathan Lampson

This lesson illustrates the proterozoic age of the history of the earth.

See More
Fast, Free College Credit

Developing Effective Teams

Let's Ride
*No strings attached. This college course is 100% free and is worth 1 semester credit.

37 Sophia partners guarantee credit transfer.

299 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 33 of Sophia’s online courses. Many different colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.



The proterozoic age was a period of time 542-2,500 million years ago.  During the proterozoic age of the earth, basic organisms of algae and invertebrates were common.  Mammals were not present on earth yet.


The oldest fossils of complex cells known as eukaryotes are from the proterozoic age.  The proterozoic age occurred before any complex life existed on earth.


This is an image of a stromatolite, a record of some of the most ancient life on earth preserved in rock.

Proterozoic Age