Banded iron formation

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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Notion

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Science and technology

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What Wikipedia says

Banded iron formations (BIFs; also called banded ironstone formations) are distinctive units of sedimentary rock consisting of alternating layers of iron oxides and iron-poor chert. They can be up to several hundred meters in thickness and extend laterally for several hundred kilometers.

Excerpt from the Wikipedia article “Banded iron formation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Graeme Churchard from Bristol, UK, CC BY 2.0, via Wikimedia Commons.