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Hardpan is found in the A Horizon.
Hardpan is a common name for a compaction layer below ground that can be caused from plowing, driving over the area, etc.
Basically it is as the name implies just like a "hard pan".
A playa
Sandy, sandy loam. Regosol. gypsic or calcic B horizon hardpan typical of the soil.
Caliche soil is a result of aged desert soils. As the soil ages they tend to form a calcium carbonate-rich hardpan horizon.