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John Day Fossil Beds NM,Sheep Rock unit,Blue Basin, photo
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Blue Basin Strata

John Day Fossil Beds NM

This blue-green rock layer represents millions of years of volcanic ash accumulation. Surprisingly enough, the green tint is not due to copper, but rather a complex blending of the elements hydrogen, oxygen, sodium, magnesium, aluminum, silicon, potassium, calcium, iron, strontium, and barium. Photo © copyright by Robert Faucher.

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