Banded Iron Formation from Australia formed between 1.8 and 2.5 thousand million years ago.

Uploaded 7 Dec 2017
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© Colin Henshaw
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Photo Info
UploadedDecember 7, 2017
TakenNovember 19, 2017
MakeCanon
ModelCanon PowerShot SX620 HS
Exposure1/4 sec at f/3.2
FlashNo Flash
Focal Length4.5 mm
ISO100
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Photo license: © All rights reserved

This is a kind of stromatolite formation formed as a result of bacterial action. Erosion was washing iron compounds into the oceans, and oxygen released by photosynthetic organisms was converting the iron compounds into insoluble iron oxides that were precipitated. Once all the iron compounds had been oxidized the oxygen was then released into the atmosphere, paving the way for organisms the could depend on aerobic respiration.

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