Sunday, 16 July 2017

2.6 billion year-old rock on display in London

A rock formed 2.6 billion years ago and found in a Rio Tinto mine in Western Australia’s Pilbara region will be displayed at London’s Natural History Museum. The 2.5 tonne rock sourced from the Mt Tom Price Mine will be part of an exhibition celebrating the natural world. The colourfully layered rock is a piece of banded iron formation created when bacteria in the earth’s young oceans began to produce oxygen through photosynthesis.
That oxygen combined with iron in the water to form iron oxide and sank to the sea floor.

Layers of it developed between layers of silica-rich sediment and played an essential role in oxygenating the ocean and supporting the evolution of more complex life.