A misconception as to the whereabouts of the type locality of the Darby Formation (largely Devonian), introduced in several recent reports, has led to erroneous conclusions regarding the stratigraphic nomenclature and correlation of this unit in parts of western Wyoming. This has come about because some authors interpreted “typical section” to mean “type section.” No type section of the Darby Formation has ever been designated, only a type locality, which is in the canyon of Darby Creek in the Teton Range. A typical section is on Sheep Mountain in the Wind River Range, 60 mi southeast.

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