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Please Click on this link to read the enviornmental assessment:
http://www.nps.gov/grca/parkmgmt/trans.htm
Did You Know? The Cambrian seas of the Grand Canyon were home to several kinds of trilobite, whose closest living relative is the modern horsehoe crab. They left their fossil record in the mud of the Bright Angel Shale over 500 million years ago.
Last Updated: February 15, 2008 at 12:09 EST