Frenzel, H.; Mundorff, M. (1942). Fusulinidae from the Phosphoria formation of Montana. Journal of Paleontology. 16(6): 675-684.

352255

Frenzel, H.; Mundorff, M.

1942

16(6): 675-684

Publication

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There has been considerable controversy over the age of the Phosphoria formation during the past decade. Evidence from brachiopods and ammonoids has been construed to indicate a Leonard or Word age for at least a part of the formation, but few fossils from the base and summit of the formation have been studied. A well preserved fusulinid fauna from limestones just above the Tensleep-Quadrant sandstone, near Three Forks, Montana, is of particular interest for the bearing these fossils have on the age determination of the basal Phosphoria. This is the first record of fusulinids in the Phosphoria. The fusulinids have been identified as Schwagerina laxissima Dunbar and Skinner, 1937, and a new species of Pseudoschwagerina named Pseudoschwagerina montanensis n. sp. These fossils indicate a Lower Permian age for the beds containing fusulinids, and indicate correlation of these beds with the Wolfcamp and Hueco formations of Texas.

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