banded iron formations  search
BTsedimentary rocks
 .chemically precipitated rocks
 ..iron formations
 ...banded iron formations
UFBIFs
RTalgoma-type deposits
 banded materials
 ferruginous composition
 iron-rich composition
 itabirite
 jaspilite
 taconite
SNBefore 1998, also search iron formations AND (banded materials OR banded structures).