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The Lower Triassic (Smithian) Thaynes Formation represents a broad spectrum of paleoenvironments. Samples collected along a depth-related gradient from tidal flats to a relatively deep, commonly dysaerobic, basin yielded an abundant conodont fauna. Simple chi-square tests and multivariate analyses using six conodont entities indicate the presence of three distinctive biofacies related to the general environmental gradient. The restricted inner shelf is characterized by Parachirognathus. The outer shelf is distinguished by a diverse conodont fauna including Furnishius. Basinward, the low diversity conodont fauna is dominated by species of Neogondolella. Some Early Triassic conodonts such as Neospathodus are ubiquitous and...

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