We are having some problems with "chat" and are experiencing delays with messages. Either leave contact details so I can get back to you or email your query to mal@scienceofmagic.co.uk

z Login

This section doesn’t currently include any content. Add content to this section using the sidebar.

Image caption appears here

Add your deal, information or promotional text

Banded Iron formation

Banded Tiger Iron
Age: Archean. (3.1 billion years ago)
Location:  Ord Ranges, Cleaverville Formation,West Australia 

Banded Iron formations consist of thin laminated bands of chert and hematite, frequently in association with tiger eye. They are always very ancient, ranging from 3.8 billion years ago until 1.2 billion years ago (with a brief reoccurrence between 800-600 million years ago during snowball earth). The hematite in these formations are due to the precipitation of iron oxide, which occurred when dissolved iron came in contact with oxygenated seawater. The oxygenation of the ocean was due to the arrival of cyanobacetia, which release oxygen as a byproduct of photosynthesis.

Eventually so much oxygen was released by cyanobacteria that the Earth's atmosphere changed. This led to the great oxygenation event which occurred between 2.4 and 2.2 billion years ago. Up to this point all life on Earth had occurred in an anaerobic environment. The change in oxygen levels probably lead to the Earth's first mass extinction event and changed the nature of the Earth forever. Life remade the world and banded iron formations mark this miraculous moment.


This photograph is of the item offered for sale.