Bog iron refers to impure iron deposits that develop in bogs or swamps by the chemical or biochemical oxidation of iron carried in the solutions.

It was discovered during the Pre-Roman Iron Age, and most Viking era iron was smelted from bog iron.

See: limonite.

External links

• Hurstwic: Iron Production in the Norse Era
• Talzhemir's Bog Iron Page
• Bog Iron Industry in The Pinelands
• The Iron Industry in New Jersey
• Bog Iron Formation in the Nassawango Watershed, Maryland U.S. Geological Survey: Open-File Report 03-346