Banded Iron Formations (BIFs) are sedimentary rocks ... Research on the Shilu BIF in South China has also provided valuable insights into the depositional environments of BIFs during the ...

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 ...