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banded iron formation

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banded iron formation [¦band·əd ′ī·ərn fȯr‚mā·shən]
(geology)
A sedimentary mineral deposit consisting of alternate silica-rich (chert or quartz) and iron-rich layers formed 2.5-3.5 billion years ago; the major source of iron ore.
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Called banded iron formations or BIFs, these ancient rocks formed between 3.
Banded rocks may reveal Earth's environment 2 billion years ago by Asian News International
Analyses of chromium isotopes in banded iron formations that accumulated during various intervals between 3.
Atmosphere took roller-coaster ride around time of Earth's ... by Perkins, Sid / Science News
The Cedar Hill and Russell Mountain deposits exhibit thinly laminated banded iron formation (BIF) hematite with oolitic hematite laminae and red jasperoid.
Geology & geophysics senior section by Nold, John / Transactions of the Missouri Academy of Science
 
 
 
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