Archaean Banded Iron from Wisconsin

Stromatolites Banded Iron Deposit


Geologic Age: Neoarchaean (2.73 Billion Years Old)

Size: 222 mm by 130 mm (maximum)

Fossil Site: Jackson County Iron Formation, Wisconsin

Neoarchaean Banded Iron from WisconsinDescription: This banded iron is metasediment (sediment that has undergone metamorphism) and has a high content of magnetite (Fe3O4), making it a natural magnet, also resulting in the midnight black coloration. Minute crystalline forms of other mineral-based compounds are also present; Whether the sediment was of bioorganic origin (stromatolite) is indeterminable, but likely.

The specimen has been hand-polished to a glassine finish on one side with fine carbide and diamond abrasive, a very labor-intensive job.

Stromatolites have persisted to the modern day in such places as Shark Bay, Australia where they continue their billions of years old lifestyle. While this piece would make a fine present for any natural history buff, anyone who appreciates art would also be glad to get thus wonderful specimen as a gift.

Also see: Stromatolites Across Geologic Time

click stromatolites pictures to enlarge

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