Abstract
ABSTRACT. Alluvial streambank materials from nine unstable and six stable reaches showed little variation in physical and mineralogical properties. The bulk density of all the samples was so similar that they could be considered from the same population. Particle size distributions showed that the clay fractions were slightly, but significantly, higher for the stable reaches. The mineralogy of all samples was also quite similar. The sand‐sized grains of the stable areas were less rounded than those of the unstable areas. This somewhat angular shape of the grains may have produced an interlocking between grains that added stability to the bank material. Also, clay coatings on the sand‐sized grains from the stable areas may have caused cementation between grains that also strengthened the material.
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