Reference
Landim, P. M. B., and Frakes, L. A., 1968, Distinction between tills and other diamictons based on textural characteristics: Jour. Sed. Pet., v. 38, no. 4, p. 1213–1223.
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Folk, R.L. Areal standard deviation on scatter plots: Objective method for excluding extremes and portraying density concentrations. Mathematical Geology 5, 199–201 (1973). https://doi.org/10.1007/BF02111896
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DOI: https://doi.org/10.1007/BF02111896