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.
To put these geologic periods in the proper context, you should bear in mind that the Triassic, Jurassic and Cretaceous don't cover all of prehistory, not by a long shot. First came the Precambrian period, which stretched from the earthâs formation to about 542 million years ago.