Precambrian time covers the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms ...

The Precambrian encompasses 86 percent of the history of Earth. As its name implies, this includes all of geological time prior to the Cambrian period. Hadean Era (4,550-3,850 mya) The Precambrian ...

In a study published in Precambrian Research Monday by scientists ... could suggest a "two-step" evolution to complex life on Earth. The evidence was found in marine sedimentary rocks from the ...

Paleontologists now know that the Precambrian actually did swarm with ... Any sedimentary rocks that formed before life appeared on Earth would have the high C-13 ratio of a volcanic origin.

A lot has happened in that time. Earth formed and oxygen levels rose in the foundational years of the Precambrian. The productive Paleozoic era gave rise to hard-shelled organisms, vertebrates ...