Banded Iron Formations (BIFs) (1 gen 3800000 anni a. C. – 1 gen 1800000 anni a. C.)

Descrizione:

Banded iron formations are one of the Earth;s oldest geological formations, dating back between 3.8 and 1.8 billion years ago. They consist of striped layers, alternating between iron rich minerals and silica rich rock. These banded iron formations formed as a result of oxygen (mainly produced by cyanobacteria at the start) interacting with the iron in the ocean. However, the banded iron formations were just dissolved iron before the great oxygenation event. As a result of these banded iron formations, the iron precipitated out, changing the chemical makeup of the ocean, greatly impacting the hydrosphere. Due to this, it has also impacted the biosphere, allowing for organisms to evolve into more complex versions (eukaryotes). These formations have left a geological impact on the Earth's crust, leaving behind a layer of striped minerals and rocks.

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