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Official State Soil: Port February 28th This is a photo of the layers that make up a Port soil profile. Port: Grassland Soils. Layer 1: Thick layer deposited by occasional flooding by a river. It is rich in organic matter. Layer 2: The roots of the native prairie grasses that built this soil were this deep — and sometimes deeper! Layer 3: Rainwater does not regularly seep this deep, so lime accumulates rather than washing down and out.