Illite from selected localities.
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Joekel, R.M.; Nickeln, B.L. & Wally, K.D., 2007, “Late Paleozoic Weathering and Residual Acccumulation of Minerals on Elk Creek Carbonatites, Southeastern Nebraska, USA”, Paper No. 55-26, 2007 GSA Denver Annual Meeting (28–31 October 2007). |