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The Paleocene Tongue River Member of the Fort Union Formation in the northern Bighorn Basin of south-central Montana and Wyoming, and the Cretaceous Eagle Formation at Elk Basin, Wyoming, contain abundant clastic dikes, sills, and other soft-sediment deformation structures. Clastic sills and tabular clastic dikes, which show evidence of forceful, upward injection of liquefied sediments, have been cited as evidence for past seismic shaking. Sills and dikes with such characteristics are common in the field trip area and we interpret them to be paleoseismites that formed during the late Cretaceous-Eocene Laramide orogeny. Other structures indicating liquefaction and flow of...

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