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.
All of the important work of the Precambrian made the Earth ready for what would come next. A new Era was about to begin: the Paleozoic Era. There was an explosion of life forms in the next period. It is called the Cambrian Period. Return to Geologic Time Line Learn more about the Precambrian Era