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[[margin]] 24 May 1930. with A A Stoyanow [[/margin]]

Nankoweap Creek.
Lower Portion [Box canyon above Colorado R.]

   Beds tilted toward river at about the same angle as the stream grade, in consequence the creek flows in the Muav almost all the way.

   Just above the box canyon on the west side the Muav is faulted against the Tapeats - [[image - sketch showing relation of Muav to Tapeats]] at x in a thin sandy layer I got fossils- [[underlined]] Dorypyge [[/underlined]]. Dr. Stoyanow and I agreed, after considerable search that these are actually in the Muav, which therefor proves conclusively that this formation is Middle Cambrian as we had previously deduced on theoretic grounds.