40Ar/39Ar date of a bentonite associated with a methane seep deposit in the upper Campanian Baculites compressus Zone, Pierre Shale, South Dakota
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1976 ◽
Vol 13
(12)
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pp. A151
2004 ◽
Vol 212
(3-4)
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pp. 277-294
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1973 ◽
Vol 37
(6)
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pp. 919-923
2015 ◽