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How do Red Beds affect the formation of Oxygen?

I have to write an essay about it for science, and I don't understand. Can someone explain? Or give me a link (other than wikipedia) to a website with good information of the history of Red Beds?

Public Comments

1. Red beds actually are affected by the formation of iron oxide (rust) in a process which removes oxygen from the atmosphere and buries it.
2. They don't. Oxygen affects the formation of Red Beds, though Red Beds are no longer forming. Way back in the day before life, the oceans were saturated with Fe. When Oxygen started building up in the atmosphere, the O2 would react with the Fe and precipitate out of solution and it would gather as sediment on the sea floor. This process, of course, took a very long time to happen. This is one of the first ways that oceans became a good habitat to support life.