Altered tuffs in the late Oligocene to early Miocene Arikaree Formation.
Mineral List
2 entries listed. 2 valid minerals.
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References
Forsman, N.F. (1986). Documentation and diagenesis of tuffs in the Killdeer Mountains, Dunn County, North Dakota. Report of Investigation No. 87, North Dakota Geological Survey.
Lowers, H.A., Adams, D.T., Meeker, G.P., and Nutt, C.J. (2010). Chemical and morphological comparison of erionite from Oregon, North Dakota, and Turkey: U.S. Geological Survey Open-File Report 2010–1286, 13 p.
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