The Noonday Dolomite, Johnnie Formation, Stirling Quartzite, Wood Canyon Formation, and Zabriskie Quartzite of probable Late Precambrian-Cambrian age, are conformable and predominantly detrital. Correlations are facilitated by the regional persistence of most members, the distinctive lithologic character of the Noonday Dolomite, and the presence of two marker units--an oolite and a volcanic ash(?)--high in the Johnnie Formation. Isopachous contours appear to outline a north-northwest trending marine trough, and suggest that the Mojave block existed as a topographic high in late Precambrian-Cambrian time.

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