Digital Geologic-GIS Maps of Bighorn Canyon National Recreation Area, Montana and Wyoming (NPS, GRD, GRI, BICA, BICA digital map) adapted from a U.S. Geological Survey Open-File Report map by Rioux (1994), and a Miscellaneous Geologic Investigations Map by Pierce (1997), and Montana Bureau of Mines and Geology Geologic Maps by Lopez (2000) and by Vuke, Wilde, Lopez and Bergantino (2007) - bica_geology_gis_readme.pdf - AmeriGEOSS Community Platform DataHub. (BETA)

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