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Press Release 11-002
Widespread Ancient Ocean "Dead Zones" Challenged Early Life

Persistent lack of oxygen in Earth's oceans affected animal evolution

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Photo of Little Horse Canyon near Orr Ridge, Utah.

Little Horse Canyon near Orr Ridge, Utah: many of the study samples were collected nearby.

Credit: Ben Gill, UC-Riverside and Harvard University


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Photo of scientist Tim Lyons looking at a sample from the Georgina Basin in Queensland, Australia.

Scientist Tim Lyons looks at a sample from the Georgina Basin in Queensland, Australia.

Credit: Ben Gill, UC-Riverside and Harvard University


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Photo of drill core collected near Queensland, Australia.

Drill core collected near Queensland, Australia contains a record of past low-oxygen conditions.

Credit: Bill Gill, UC-Riverside and Harvard University


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Photo of the Notch Peak Formation, in Lawsons Cove, Utah.

The Notch Peak Formation, located in Lawsons Cove, Utah, preserves ancient biogeochemical events.

Credit: Ben Gill, UC-Riverside and Harvard University


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Photo of scientists sampling Utah's Big Horse Limestone.

Sampling Utah's Big Horse Limestone; it records the trilobite extinction and other events.

Credit: Ben Gill, UC-Riverside and Harvard University


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