ABSTRACT
They include: • Thick, laterally extensive banded iron for-
mations (BIF) that occur in Precambrian rocks throughout the world.
• Generally thinner Phanerozoic ironstones (PI) that are mainly marine/marginal in occurrence.
They include: • Thick, laterally extensive banded iron for-
mations (BIF) that occur in Precambrian rocks throughout the world.
• Generally thinner Phanerozoic ironstones (PI) that are mainly marine/marginal in occurrence.