Colorado Plateau 2005

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Day 4. Our first view of the Grand Canyon, with superb exposure of the Great Unconformity. Here the Tapeats Sandstone overlies Precambrian sedimentary rocks of the Grand Canyon Supergroup along a classic angular unconformity. These older Precambrian rocks are preserved in grabens, including the Cremation Graben which the South Kaibab trail traverses.

All images copyright © 2016 F.W. Vollmer and may not be used without permission.