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Proterozoic Eon, the younger of the two divisions of Precambrian time, extending from 2.5 billion to 541 million years ago. During the Proterozoic, the atmosphere and oceans changed significantly. Its rocks contain the fossil remains of bacteria and blue-green algae as well as the first oxygen-dependent animals.
The Geologic Time Scale is divided into four eons, ten eras, 22 periods, and several epochs and ages. Each eon, era, period, and epoch is defined by major geological or paleontological events. The eons are the Hadean, Archean, Proterozoic, and Phanerozoic.
24 sie 2024 · The Proterozoic Eon, meaning “earlier life,” comes after the Archean Eon and ranges from 2.5 billion to 541 million years old. During this time, most of the central parts of the continents had formed, and plate tectonic processes had started.
21 sie 2024 · The Proterozoic Eon, meaning “earlier life,” is the eon of time after the Archean eon and ranges from 2.5 billion years old to 541 million years old. During this time, most of the central parts of the continents had formed and the plate tectonic process had started.
17 sie 2021 · The Proterozoic Eon, meaning “earlier life,” is the eon of time after the Archean eon and ranges from 2.5 billion years old to 541 million years old. During this time, most of the central parts of the continents had formed and the plate tectonic process had started.
13 gru 2020 · The Proterozoic Eon begins at 2.5 Ga, which approximately marks the time when oxygen from cyanobacteria began to dramatically change the composition of the Earth’s atmosphere and oceans and when complex one-celled life (eukaryotes) evolved from simple cells (prokaryotes).
Part 1: Hadean Earth – The Violent Creation of Our World. Part 2: Archean Earth – Signs of Life. Part 3: Proterozoic Earth – The First Animals. Part 4: Cambrian Earth – An Explosion of Evolution. Part 5: Ordovician Earth – Colonising a Barren Land. Part 6: Silurian Earth – The First Breath of Air.
