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.
2) The Precambrian was the longest Era? (FALSE) The longest era also occurred in the Precambrian. This was the Paleoproterozoic Era (2,500 - 1,600 Ma) which lasted 900 million years. 3) The Precambrian lasted 4 billion years (TRUE) The Precambrian was the longer of the 2 super-eons.