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The Proterozoic Aeon. 2.5 Billion to 541 Million Years Ago. Ryan Somma. An artists representation of life in the Ediacaran seas during the last period of the Proterozoic aeon, including the mysterious Dickinsonia and primitive jellyfish.
20 lip 2024 · Kids Encyclopedia Facts. Lower Proterozoic Stromatolites from Bolivia, South America (polished vertical section through rock) The Proterozoic eon comes before the Phanerozoic. It was a period before the first abundant complex life on Earth. The name Proterozoic comes from the Greek "earlier life".
This animated video discusses the the Proterozoic era. The proterozoic era is a geological eon representing a period before the first abundant complex life on Earth
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.
Classically, the boundary between the Proterozoic and the Phanerozoic eons was set at the base of the Cambrian Period when the first fossils of animals, including trilobites and archeocyathids, as well as the animal-like Caveasphaera, appeared.
In the Proterozoic Eon, key highlights are: ozone layer thickened, an oxygen crisis, Snowball Earth and eukaryotes and multicellular organisms evolved.
1 paź 2023 · The Proterozoic eon is the longest eon in all of Earth's history lasting 2 billion years. Only 2/3% of Earth's surface was dry land. This Eon is the first time life became larger than a cell.
