Banded iron formations: Oceans, algae and iron oxide
Most of the world's iron ore is found in rocks called banded iron formations or BIFs. BIFs occur on all continents, and in ...
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The heavy metal rock bands charting life on early Earth
At 2.5 billion years old and weighing in at 2.5 tonnes, the banded iron formation is so heavy that Museum engineers had to reinforce the floor underneath it in Hintze Hall. 'The rock tells a ...