We thank Graham Shields for alerting Geology readers to his work in Mongolia, and for his comment on our manuscript. Although we are puzzled by his suggestion of “errors and omissions” (and even naughtiness!) in our article, we attempt here to clarify some of his concerns.

First, it is important to note that our paper was not an attempt to tout the Death Valley section as the “best,” most critical section in the world. Rather, we feel that any section that contains both a basal occurrence of Treptichnus pedum and another means for correlation (in this case, carbon isotopes) is...

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