Precambrian time covers the vast bulk of ... remains of plants and animals buried when the sediments were formed. The Earth was already more than 600 million years old when life began.

The Precambrian eon is vast ... Prelude to life (4,550-3,900 mya) Planet Earth is very hot at its formation. As it cools and its mass increases, its gravitational field strengthens.

Curtin University researchers have discovered the world's oldest known meteorite impact crater, which could significantly ...

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 ...

Northwest geologists’ research on the formation and evolution of the ... Nuna (Columbia), as well as the geology of the Precambrian era. Earth scientists in the department also closely monitor ...

claiming that optimal conditions alone do not equate to life being formed earlier. The general scientific consensus was that complex life started on Earth approximately 635 million years ago.

A team of international researchers has challenged the long-held belief that complex life forms first emerged on Earth 635 million ... In a study published in Precambrian Research Monday by ...