Scales of Time

Hundreds of millions of years were needed for the Colorado plateau to accumulate its material under an ocean. Hundreds of million more were needed to expose it to the atmosphere, when erosion would carve canyons and spires into its surface. Plants and animals would evolve over this time, adapting or dying out with the changing conditions. Humans are the latest inhabitants in this history. Click on the image for a larger view

Desert Stereo

This photograph is a stereo pair that allows a viewer to see the desert landscape near Phoenix Arizona in 3-D. To do that, look at the black line separating the images and cross your eyes to overlap the left and right images—you should see three images, the stereo image is in the center with the left and right images on each side. Seeing a stereo image may take a bit of practice and you may need to rotate your head to fuse the two panels. You can enlarge the image by clicking on it. The larger image may be easier to view.

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