Outcrop, petrographic, and subsurface analysis of the Sappington Member, Three Forks Formation, and Cottonwood Canyon Member, Lodgepole Formation, central Montana
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The Sappington Member of the Three Forks Formation (latest Devonian) and the overlying Cottonwood Canyon Member of the Lodgepole Formation (Early Mississippian) outcrop in various locations of the Disturbed Belt throughout south-central Montana. These two members are correlative, lithologically similar, and deposited contemporaneously with the Bakken Formation in the Williston Basin (North Dakota). Three outcrops of the Sappington and Cottonwood Canyon members near Bozeman, Montana were examined in August, 2015 to construct stratigraphic logs and collect samples for petrographic and x-ray ...