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Bhattacharyya, A, 2000, Analysis of Sedimentary Successions: a Field Manual: A. A. Balkema, Rotterdam. , Jr. and D. Krinsley, 2006, Application of Cathodoluminescence Imaging to Study of Sedimentary Rocks: Cambridge University Press, Cambridge. Busby, C. J. and R. V. ), 1995, Tectonics of Sedimentary Basins: Blackwell Science, Cambridge, MA. Krinsley, D. , K. Pye, S. , and N. K. Tovey, 1998, Backscattered Scanning Electron Microscopy and Image Analysis of Sediments and Sedimentary Rocks: Cambridge University Press, Cambridge.

More accurate frequency curves can allegedly be constructed by a technique described by Folk (1974) involving graphical differentiation of the cumulative curve. A cumulative curve is generated by plotting cumulative weight percent frequency against phi size. Cumulative curves can be constructed that use either an arithmetic scale (Fig. 1C) or a log-probability scale (Fig. 1D) for the ordinate. Plotting a cumulative curve on a probability ordinate yields a straight line if the grain-size values have a log-normal distribution (explained below).

Redrawn from Friedman, G. , 1967, Dynamic processes and statistical parameters for size frequency distributions of beach and river sands: J. Sediment. , 37, Fig. 5, p. ] All of this has importance mainly if grain-size data provide information that is useful in evaluating the economic significance of sedimentary rocks or in interpreting some aspect of Earth history. Geologists recognize, for example, that grain size and sorting affect the porosity and permeability of sedimentary rocks and thus the ability of these rocks to transmit and store fluids.

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