Landman, N. H., Jicha, B. R., Cochran, J. K., Garb, M. P., Brophy, S. K., Larson, N. L., & Brezina, J. (2018). 40Ar/39Ar date of a bentonite associated with a methane seep deposit in the upper Campanian Baculites compressus Zone, Pierre Shale, South Dakota. Cretaceous Research.
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