________ formed during the Precambrian under reducing conditions when the atmosphere was depleted in oxygen.
A)Sulphur zones
B)Banded iron formation (Superior type)
C)Limonite rust fillings
D)Goethite veins

Question

Quizplus · Accepted Answer

Banded iron formations (Superior type) formed during the Precambrian under reducing conditions when the atmosphere was depleted in oxygen. These formations consist of alternating layers of iron-rich minerals (such as hematite and magnetite) and silica-rich minerals (such as chert).

________ Formed During the Precambrian Under Reducing Conditions When the Atmosphere