Not that weâd expect less after the cliffhanger last season. If you havenât yet watched the September 23rd premiere of Chicago Fire, and somehow have managed not to find out who died, donât keep reading. If you have, please join me in my misery.
The Precambrian Super-Eon lasted from the formation of Earth 4,567 million years ago until the start of the Pharerozoic Eon 542 million years ago. It lasted 4.025 billion years. 90% of Earth's history.
The Precambrian Eon The name means: before the Cambrian period. This old, but still common term was originally used to refer to the whole period of Earth's history before the formation of the oldest rocks with recognizable fossils in them.