Abstract

Logarithmic plots of the coarsest 1-percentile grain size (C) and the median grain size (M) of alluvial-fan deposits make distinctive patterns for samples from western Fresno County, California. CM pattern for the tractive-current sediments parallels the limiting line C=M and swings upward where C is about 1500 microns. The mudflow CM pattern is rectilinear and approximately parallels the line C=M. C is about 40 to 80 times M along the axis of the mudflow pattern.

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