Banded iron formations were deposited in the Archean and Paleoproterozoic eons, roughly between 3.8 and 1.8 billion years ago. Life back then was confined to one-cell organisms in the oceans.

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 ...

Japanese researchers have found evidence that during the Archean eon— a period around ... full of sedimentary rocks that contained Banded Iron Formations, a type of chemical sediment containing ...

Cross section of banded iron formation in Karijini National Park ... Oxygen released by the rise of photosynthesis in the Archean eon then led to oxidized iron in seawater. The paper's computer ...

Banded iron formations are characteristic patterns that ... When the world contained little or no oxygen during the Archean aeon, the transformation began. Early life forms utilised a type of ...

Figure A shows a banded iron formation. These structures were formed from 2.5 billion years to 1.8 billion years ago. Figure B shows a stromatolite. Stromatolites were first formed 3.5 billion years ...