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Aerial view of the Grand Canyon, AZ. This view shows the steep Inner Gorge, cut into Proterozoic metamorphic rock, and the overlying Paleozoic sedimentary rocks. The Great Unconformity lies between them at the top of the Inner Gorge.
Marli Miller/Visuals Unlimited, Inc.
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Visuals Unlimited, Inc. specializes in, microscopy, healthcare, medical, wildlife, underwater, agriculture, and science stock photography.