In geology, a claypan is a dense, compact, slowly permeable layer in the subsoil having a much higher clay content than the overlying material, from which it is separated by a sharply defined boundary. Claypans are usually hard when dry, and plastic and sticky when wet. They limit or slow the downward movement of water through the soil. ...
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http://en.wikipedia.org/wiki/Claypan
A layer of stiff, compact, relatively impervious clay which is not cemented. compare caliche , fragipan, hardpan.
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https://www.encyclo.co.uk/local/22327
hardpan (def. 1). · a shallow, normally dry depression in the ground that holds water after a heavy rain.
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https://www.infoplease.com/dictionary/claypan
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