Encyclopedia of Earth
Encyclopedia of Earth: Proterozoic
Article describing the Proterozoic Eon, which lasted from 2.5 billion to 543 million years ago. It covers the subdivisions of the Proterozoic Eon, geology, Earth's atmosphere at the time, climate, and life forms. (Published: July 26, 2010)
Smithsonian Institution
National Museum of Natural History: Paleobiology: The Proterozoic Eon
Journey into the past while reading this comprehensive overview of the Proterozoic Eon that covers topics such as the Prokaryotic life, Eukaryotes, glaciation, fauna evidence, and multicellular life forms.
Sophia Learning
Sophia: Proterozoic Age: Lesson 3
This lesson illustrates the proterozoic age of the history of the earth. It is 3 of 3 in the series titled "Proterozoic Age."