Triassic Sedimentary Rocks

In most of the ranges of the EMNSA that contain latest Proterozoic and Paleozoic sequences (see previous section), these strata are conformably overlain by reddish sandstone, limestone, and shaley limestone, or their metamorphosed equivalents. These rocks are correlated with the Early to Middle Triassic Moenkopi Formation (Burchfiel and Davis, 1971, 1977; Walker, 1987). In the Providence Mountains, this unit is approximately 300 m thick and contains Early Triassic fossils. In many ranges, these rocks are metamorphosed to distinctive calc-silicate rock (Stone and others, 1983).

In the Mescal Range, a unit of sandstone, shale, and limestone stratigraphically above the Moenkopi Formation and below a Jurassic sandstone unit was correlated with the Late Triassic Chinle Formation by Hewett (1956). This correlation was questioned by Marzolf (1983), who considered several Jurassic units to lie directly on the Moenkopi. Possible Chinle-correlative rocks have not been reported elsewhere in the EMNSA.

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