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Gulbrandsen, R A; Reeser, D W (1969): Permian manganese nodules near Dillon, Montana. PANGAEA,, Supplement to: Gulbrandsen, RA; Reeser, DW (1969): An occurrence of Permian manganese nodules near Dillon, Montana. In: Geological Survey Research 1969, Chapter C, U.S. Geological Survey Professional Paper;, 650C, 49-57, hdl:10013/epic.46181.d003

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Concentrically ringed manganese nodules, similar in form to many found on modern ocean and sea floors, occur in a very fine grained argillaceous sandstone bed of the Permian Park City Formation near Dillon, Montana. They are enriched in many rare elements and contain us much as 2.5 percent zinc, l.3 percent nickel, and 0.22 percent cobalt. The manganese minerals are chalcophanite and todorokite. The nodules probably formed in a shallow marine oxidizing environment on the western side of the Permian sedimentary basin. The occurrence of an appreciable amount of fluorite in the bed suggests that the water was saline.
Source data set:
Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA,
Further details:
Latitude: 44.681803 * Longitude: -112.745511
2 datasets

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