Abstract

Sulfur isotope analyses of gypsum in outcrop and subsurface samples from the Lower Devonian Bear Rock Formation gave δ34S values ranging from + 10.3 to + 21.8‰ (mean + 16.1‰, standard deviation 2.85‰); samples from the Upper Cambrian Saline River Formation gave δ34S values ranging from + 24.7 to + 40.2‰ (mean + 30.3‰, standard deviation 3.65‰). The lower portion of one outcrop section of 532 ft (162.2 m) on the northeast side of the Norman Range (Franklin Mountains), mapped as Saline River Formation, showed anomalous δ34S values (+ 10.3–+ 18.7‰), suggesting correlation with the Bear Rock Formation. It is likely that at least 97 ft (29.6 m) of Bear Rock strata are present in this section, overlain by a maximum of 435 ft (132.6 m) of gypsiferous Saline River strata that form the base of the main thrust plate of the Norman Range in this locality.

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