The canyon is 277 miles long, and over a mile deep.

It exposes nearly two billion years of geological history.

The Colorado River began carving it at least 17 million years ago.

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All photos were taken in 1983.

These are digital copies of Stereo Realist slides.

The colors in the slides have changed dramatically since the photographs were taken.

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For more realistic color views of the canyon, see the Grand Canyon page on my 2D website

          martylobel.wixsite.com/martylobel.