Abstract
The mineralogy of the clay fraction was determined by a combination of methods on samples of eight layers from each of two profiles. Among them, five layers were derived from andesitic ash and three layers from dacitic ash. Conclusions that could be drawn from the mineralogy follow: 1.(1) The amounts of layer silicates were much higher in materials from dacitic ash than in those from andesitic ash.2.(2) Opaline silica was found only in the IA1 and IIIA2 horizons at and near the land surface but not in the intervening II(B) horizon.3.(3) Allophane and imogolite were absent or nearly absent in the IA1 and the oldest VIIIA1 horizons. All other buried A, and (B) horizons contained allophane and imogolite. Allophane-like constituents were present in all the horizons except for the VIIIA, horizon.
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