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Official State Soil: Forkwood September 14th This is a photo of the layers that make up a Forkwood soil profile. Forkwood: Desert Soils. Layer 1: Soil surface with little decaying plant matter. Layer 2: Layer is rich in clay washed down by seeping rainwater. Layer 3: Rainwater does not regularly seep this deep, so lime builds up rather than washing down and out. Layer 4: Lime in this layer makes the soil fizz when you add a little acid.