Tidalites in the Eureka Quartzite (Ordovician), Eastern California and Nevada
The Eureka Quartzite (Ordovician) occurs as a well-exposed, cliff-forming sandstone in the Basin-and-Range Province of eastern California and Nevada over an area in excess of 200,000 sq km2 and ranges in thickness from 50 to 150 meters (Ross, 1964; Webb, 1956). Selected outcrops (Fig. 17-1; Table 17-1) contain a variety of sedimentary and biogenic structures indicating the Eureka Quartzite to be a tidalite (cf. Klein, 1971; Swett et al., 1971). The Eureka is sandwiched between the intertidal carbonates of the Ely Springs Dolomite (Chamberlin, 1975) and the Pogonip Group (Stricker, 1973). The general stratigraphic relationships are summarized in Figure 17-2.
KeywordsQuartz Sandstone Petrol Dolomite Stratigraphy
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