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 began with the formation of Earth around 4600 Ma (million years ago). It extends to the beginning of the Cambrian Period, about 542 Ma, when macroscopic ha â¦ rd-shelled animals first appeared in abundance.he Precambrian is a longer span of geologic time leading up the the Paleozoic era. During the Cambrian period of the Paleozoic era, there was an explosion in the evolution of â¦ life forms.