Banded iron formation

-2,1 milliards d’années (Précambrien)

Musée des Confluences

Musée des Confluences
Lyon, France

Our origins of living beings

Nearly 4 billion years ago molecules, such as amino acids, were responsible for the formation of life on earth. Bacteria, the first living beings, progressively introduced oxygen into the oceans and atmosphere: then life really took off.

Until 2 billion years ago, most of the oxygen produced by bacteria remained trapped at the bottom of the ocean in the form of iron oxides.


  • Title: Banded iron formation
  • Date Created: -2,1 milliards d’années (Précambrien)
  • Location: United States (Michigan - Marquette)
  • Physical Dimensions: H: 22 cm; L: 51 cm; D: 6 cm
  • Subject Keywords: earth sciences, petrology, permanent exhibition
  • Rights: Musée des Confluences (Lyon, France) © Jennifer Plantier
  • External Link: Learn more at the museum website
  • Medium: quartz, oxidized iron

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