Grangeville Series
Grangeville Series This young (Holocene age) soil is far different than the salt affected soil from the Cuyama valley. It is formed in young alluvium and has no horizons limiting to plant growth. It has an A horizon that reflects some organic matter accumulation. The organic matter slowly decreases in the profile until, at some depth below 2 meters, a relatively unweathered alluvium is reached. The unweathered material is the C horizon. Usually a transitional AC horizon is described between the A and C horizons. Because this soil has no root or water-movement limiting horizons and has many of the original weatherable minerals that contribute to natural soil fertility, it is considered one of the best soils in California.

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