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John Day Fossil Beds NM,Sheep Rock unit,Blue Basin,Turtle Cove strata, photo
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Green Mud & Red Rocks

John Day Fossil Beds NM

Turtle Cove strata, a striking blue-green rock layer produced by millions of years of volcanic ash accumulation, when admixed with the intervening yellow strata by water erosion, produces the green water and mud. The boulders contain iron oxides which produce the red coloration. Photo © copyright by Robert Faucher.

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