Results for: Proterozoic

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In Geology

How long did the Proterozoic eon last?

The Proterozoic eon was the third eon in Earth history. It lasted from 2.5 billion years ago to 542 million years ago. Therefor, the Proterozoic was nearly 2 billion years lon… (MORE)

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In Atmospheric Sciences

What do Proterozoic-aged red beds and banded iron formations tell us about the Earth's early atmosphere?

Banded iron formations indicate that there were oxygen-rich and oxygen-poor episodes during Earth's early atmosphere. Banded iron formations first appear in the Archean, 3 bil… (MORE)

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In Dinosaurs

How long did the proterozoic era last?

The Proterozoic eon was the third eon in Earth history. It lasted from 2.5 billion years ago to 542 million years ago. Therefor, the Proterozoic was nearly 2 billion years lon… (MORE)

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In Paleontology

What major change occurred in life-forms at the end of the proterozoic?

The middle Proterozoic comes the first evidence of oxygen build upin the atmosphere. This is how the eukaryotes formed. They includemulticellular algae.

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In Paleontology

What life forms were in the proterozoic eon?

There were no life forms as we know them during the Proterozoic period. With oxygen just then being accumulated in the earth's atmosphere, it brought the first advanced single… (MORE)

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In Elements and Compounds

Did oxygen exist in the atmosphere during the Proterozoic?

Certain minerals oxidize, or rust, in the presence of free oxygen. Proterozoic red beds are sedimentary rocks deposits that contain oxidized iron. They are the evidence that t… (MORE)