There are more than twenty banded iron formation (BIF, BIFs) sites around the world. These formations were formed more than a billion years ago. There were three occurrences during the Precambrian era between 3.8 – 0.6 billion years. The three BIF eras were: 0.6-0.85, 1.8-3.5 and 3.65-3.8 billion years.

BIFs are made up of banded, or alternating layers of iron-rich minerals such as Fe(II), Si and Siderite rich sedimentary rock (Kappler, et al., 2005, Wang et al, 2009). The thickness of the bands is known to be from metres to centimetres and in some places millimetres thick (Konhauser et al., 2002). All formations have been well dated by isotopic dating of lead and uranium, so their ages have been well constrained.

The main areas of deposits are: Canada, Ukraine, Brazil, South Africa. Others include Isua, West Greenland, which is the oldest and occurred on its own 3.65-3.8 billion years ago. Australia, has more than four BIFs, all of which occurred during the middle episode between 1.8-3.5 Ga (billion years).

• Font Ukrainian

• Ukraine Cheap Tickets Chicago Flights To London Uk

  Search and compare cheap flights to Ukraine across multiple online travel sites with one click.

• Ukrainian Dictionary Online

• Soccer Ukraine Albania

  Livesportstvs.com. Watch Live Sports and news Tvs Live video and Streaming Links Soccer Cricket Tennis Basketball and other sports free live online

• Sms Ukraine