Definitions for "Banded iron formation"
Keywords:  chert, bif, sedimentary, iron, billion
old sedimentary rock comprising alternating layers of more or less oxidized iron oxides
Rock composed of bands or layers of minerals (rocks) differing in color and texture.
A rock that is made up of alternating light silica-rich layers and dark-colored layers of iron-rich minerals, which were deposited in marine basins on every continent about 2 billion years ago.