Caption below states:
~ Mile 136.5: Trace fossils in Cambrian age sediments along Deer Creek. Trace fossils are abundant in the upper Tapeats Sandstone and overlying Bright Angel Shale(Middleton and Elliot, 1990).
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The URL is: https://gotbooks.miracosta.edu/gonp/grca/river/html/grca3040.htm
Last modified: 9/9/2010