Application of physical criteria to regional stratigraphy of the Chugwater Group (Triassic) in Wyoming establishes well-defined lithologic correlations of units; these physical correlations permit more complete reconstruction of paleogeography and subsequent tectonic events, and demonstrate the interpretive significance of red beds. Correlations of the Crow Mountain, Popo Agie, and Jelm Formations, and lithologic correlation of the Popo Agie and Jelm with the Ankareh, exploit the thin but widespread, laterally persistent nature of these rock units and lends new continuity to the geologic history of the Triassic Wyoming shelf.

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