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Abstract

Extensive areas of the Powder River Basin in southeast Montana and northeast Wyoming are underlain by the Paleocene Fort Union Formation (Fig. 1). The sites selected for the field guide (Fig. 1) are easily accessible via the Powder River road from U.S. 212 (Broadus, Montana) to U.S. 14-16 (northeast of Arvada, Wyoming). The Powder River road is a county road that has a hard gravel surface easily traversed by cars. The outcrops are located either immediately along the road or only 0.25 mi (0.4 km) from the road. The lands along the Powder River are either managed by the Bureau of Land Management or privately owned by ranchers, who reserve the right to grant access to these lands. However, numerous field trips sponsored by the American Association of Petroleum Geologists, U.S. Geological Survey, North Dakota Geological Survey, and Casper College have been permitted access to the study sites. Permission was provided with the agreement that field-trip participants respect the land by not littering, not leaving gates open to stock, and carefully observing fire prevention rules. The rancher to contact for sites 1 and 2 is William Gaye, and the rancher for site 3 is Richard Reese. Mr Gaye maintains a ranch house on the Powder River road; Mr. Reese has a residence in the vicinity of Leiter, Wyoming (Fig. 1).

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