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 Era spans over three billion years whereas the time since the end of the Precambrian has only been 500 million or a half billion years. This covers the time from the birth of the earth to what is known as the Cambrian explosion when fossils became abundant in the rocks.