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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.
Part 13: Paleogene Earth – The Rise of Mammals. Part 14: Neogene Earth – Human Ancestors. Part 15: Quaternary Earth – The Age of Man. Spanning almost 2-billion years, the Proterozoic era saw the evolution of a world we could almost recognise today.
Each eon, era, period, and epoch is defined by major geological or paleontological events. The eons are the Hadean, Archean, Proterozoic, and Phanerozoic. The Phanerozoic Eon is the eon of visible life, and is divided into three eras: the Paleozoic, Mesozoic, and Cenozoic.
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.
In the Proterozoic Eon, key highlights are: ozone layer thickened, an oxygen crisis, Snowball Earth and eukaryotes and multicellular organisms evolved.
21 sie 2015 · Some examples of Proterozoic Metazoans are Cyclomedusa, Tribrachidium, Cloudina, and Charniodiscus. Eukaryotes are incredible important because they are the first cells in Earth history to reproduce sexually. Acritarchs are one example of a Proterozoic Eukaryote.
