Keywords

[banded iron formation] Iron formation that shows marked banding, generally of iron-rich minerals and chert or fine-grained quartz.  Abbrev: bif.

Geological keywords, such as “granite”, “lake”.  The definitions are generally taken from the AGI Glossary of Geology.  Keywords with a geographic context (e.g. Cape Smith Fold Belt, Selwyn Basin, Grenville Province) are assigned to a separate category.