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Official State Soil: San Joaquin July 6th This is a photo of the layers that make up a San Joaquin soil profile. San Joaquin: Clay-Rich, Miditerranean-Climate Soils. Layer 1: Plowing mixes decaying plant matter into the top six inches. Layer 2: Clays washed down by seeping rain accumulate in this layer. Layer 3: A layer of hard, cemented silica is a barrier to root growth.