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The Cretaceous Lewis Shale-Fox Hills-Lance Formations in southern Wyoming (1) were deposited during the final transgressive-regressive cycle of the Cretaceous western interior seaway (2). These formations comprise a third-order highstand systems tract (3) composed of several fourth-order lowstand-highstand cycles. One of these fourth-order cycles is well exposed in three outcrops — called Spine 1, Spine 2, and Rattlesnake Ridge — over a distance of 3.2 km (2 mi) (4). The strata within these outcrops are important for two reasons: 1) they provide good outcrop exposures of the...

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