• Two

    John Day Fossil Beds

    National Monument Oregon

Sheep Rock

Sheep Rock

Sheep Rock

This unit features:

Image of the Blue Basin trail area.

View from the Blue Basin Overlook

Multiple exposures of the Turtle Cove strata can be seen at the Sheep Rock Unit. 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.

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