Jaspilite | Roth's Rocks Jaspilite is a Banded Iron Formation. It is also known as B anded Ironstone and is a distinctive unit of sedimentary rock that are almost always of Precambrian age. A typical Jaspilite consists of repeated, thin layers, of silver to black iron oxides, either Magnetite (Fe 3 O 4 ) or Hematite (Fe 2 O 3 ), alternating with bands of iron-poor ... Banded Iron Formation | Western Australian Museum Banded Iron Formation Image copyright of WA Museum Most of the major iron deposits worldwide occur in rocks called banded iron formations (or BIFs for short), which are finely layered sedimentary rocks composed of alternating chert (a form of quartz) and iron oxide bands. Solved: Today, Banded Iron Formations, A Type ... - . Today, banded iron formations, a type of sedimentary rock found in many locations, provides evidence for the dramatic increase in oxygen released by cyanobacteria. Oxygen reacted with iron dissolved in the ocean.    Read More

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