Volumetric abundance of various pebble types in the sediments at the terminus of Mendenhall Glacier, Juneau, Alaska can be used to determine direction of transport from source terrane and differences in energy flux between contrasted depositional environments. Both an increase in transport distance and in energy flux independent of distance result in a relative enrichment of mechanically strong detrital rock species. The general nature of functional relationships between the relative abundance of a detrital species and distance is greatly influenced by the spectrum of resistances associated with the assemblage and the variations in degradational energy affecting the detritus.

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