During the period 1951–1954, the authors and others working in southwestern Utah and northern Arizona established new correlations between beds in the upper part of the Triassic and lower part of the Jurassic sequence that have necessitated revisions of the older published nomenclature. The revisions include a redefinition of the upper boundary of the Chinle formation and of the boundaries of the Kayenta formation in some areas; the establishment of a new formation between the redefined Chinle and Kayenta formations; elimination of the name Wingate sandstone in the Kanab, Utah, area; a redefinition of the base of the Navajo sandstone...

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