Banded iron formation (BIF). This is an intensely transformed,or metamorphosed,sediment of very ancient age. BIFs were deposited in Precambrian times,around 2 billion years ago,during a phase in the evolution of the earth known as 'the great oxygen event'. This specimen,actual width 30 centimetres,highlights the alternating bands of red jasper,black hematite and golden tiger-eye that make up this rock. The sharp folding of the layers is typical for BIF and an indication of the severe transformation the rock was subjected to. This sample is from the iron mining districts of West Australia,where BIF is widespread | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 5342 px × 3587 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |