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ABSTRACT
Wind-deposited sands have influenced characteristics of soils on Tomales Point at the northern end of Point Reyes Peninsula in California. The distribution of eolian materials, the interface between eolian and residual granitic parent materials, and mineral weathering were investigated in five pedons along a transect from near the edge of a wave-cut bluff fronting on the Pacific Ocean to near the crest of a stabilized dune. Based upon distinct textural discontinuities, proportions of rounded and angular sands, organic carbon, and phyllosilicate species in silt and clay fractions, nonconforming zones of eolian materials over granitic residuum were clearly distinguished. The soils along the transect include members of coarseloamy, mixed, isomesic Pachic Haplustolls, coarse-loamy, mixed, isomesic "Entic" Dystropepts, sandy, mixed, isomesic ustic Dystropepts, and mixed, isomesic Typic Ustipsamment families. A mineral weathering sequence involving the transformation biotite
vermiculite
smectite is evident within the buried granitic residuum along the transect.
1 Contribution from the Dep. of Land, Air, and Water Resources, Univ. of California, Davis, CA 95616.
2 Former Research Assistant, Professor of Soil Science, and Specialists in Soil Science, respectively.
Received for publication July 29, 1982. Accepted for publication July 1, 1983.
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