PROTEROZOIC
longest eon in earth's history
from 2.5 billion years ago to 541 million years ago
Major Event
Atmosphere/Climate
OCEANs
According to NOVA, the oxygen reacted with iron in the oceans, making the rocks have red-colored banded iron formations.
Great Oxygenation Event (GOE)
In the early years of the Proterozoic Eon, the Earth had little to no oxygen, however because of the cyanobacteria photosynthesis process, they released more and more oxygen, contributing to the development of the planet.
This event also led to the formation of the ozone layer. The excess oxygen from photosynthesis began to accumulate in the atmosphere. They went through photodissociation until there was more ozone (O₃) accumulated in the stratosphere to form the ozone layer.
In the early yeras, the atmosphere was mainly composed by nitrogen, carbon dioxide and methane, the oxygen was very little. The sky probably had an orange-ish color due to the methane. During the Great Oxygen Event, cyanobacteria conributed to the increase in oxygen because of the photosynthesis. With that, methane was destroyed and it led to a major cooling era. According to the NOAA (National Oceanic and Atmospheric Administration), the increase in oxygen also helped form the ozone layer.
Atmosphere
The Proterozoic Eon had both extreme warm and cold periods. During the neo-proterozoic many ice ages happened, including the "Snowball Earth" when the Earth was mainly covered in ice, glaciers extended from pole to pole due to the drop in greenhouse gasses and increase in oxygen. After Snowball Earth, there was lot of volcanic activity that released carbon dioxide. The cellular life rised due to the Earth getting warmer.
Climate
The Great Oxygenation Event changed the ocean chemistry from rich in iron to pcygen abundancy. Because of that, eukaryotic cells evolved and developed later on multicellular life. The Ice Ages freezed the oceans but once it warmed up, early animal life could be seen such as the Ediacaran group.
PROTEROZOIC EON
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Created on February 16, 2025
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Transcript
PROTEROZOIC
longest eon in earth's history
from 2.5 billion years ago to 541 million years ago
Major Event
Atmosphere/Climate
OCEANs
According to NOVA, the oxygen reacted with iron in the oceans, making the rocks have red-colored banded iron formations.
Great Oxygenation Event (GOE)
In the early years of the Proterozoic Eon, the Earth had little to no oxygen, however because of the cyanobacteria photosynthesis process, they released more and more oxygen, contributing to the development of the planet.
This event also led to the formation of the ozone layer. The excess oxygen from photosynthesis began to accumulate in the atmosphere. They went through photodissociation until there was more ozone (O₃) accumulated in the stratosphere to form the ozone layer.
In the early yeras, the atmosphere was mainly composed by nitrogen, carbon dioxide and methane, the oxygen was very little. The sky probably had an orange-ish color due to the methane. During the Great Oxygen Event, cyanobacteria conributed to the increase in oxygen because of the photosynthesis. With that, methane was destroyed and it led to a major cooling era. According to the NOAA (National Oceanic and Atmospheric Administration), the increase in oxygen also helped form the ozone layer.
Atmosphere
The Proterozoic Eon had both extreme warm and cold periods. During the neo-proterozoic many ice ages happened, including the "Snowball Earth" when the Earth was mainly covered in ice, glaciers extended from pole to pole due to the drop in greenhouse gasses and increase in oxygen. After Snowball Earth, there was lot of volcanic activity that released carbon dioxide. The cellular life rised due to the Earth getting warmer.
Climate
The Great Oxygenation Event changed the ocean chemistry from rich in iron to pcygen abundancy. Because of that, eukaryotic cells evolved and developed later on multicellular life. The Ice Ages freezed the oceans but once it warmed up, early animal life could be seen such as the Ediacaran group.