Petterson et al. (2011) have made an important contribution to our understanding of the Noonday Formation and its association with Neoproterozoic glacial events, and they present some thought-provoking insights into the depositional history implied by these rocks. Their work in the eastern Death Valley region provides important new insights into these problems, and I found the paper very useful as a reference on the complex stratigraphic relationships between the Noonday Formation and what has been called the Ibex Formation. However, I feel compelled to point out a flaw that people need to be aware of before they try to use...

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