clay pan

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clay pan:

see hardpanhardpan,
condition of the soil or subsoil in which the soil grains become cemented together by such bonding agents as iron oxide and calcium carbonate, forming a hard, impervious mass.
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References in periodicals archive ?
Ecology of four turbid clay pans during a filling-drying cycle in the Paroo, semi-arid Australia.
The Bilby brothers will be releasing bilbies into a feral-animal-free, 25-square kilometre enclosure of mulga and clay pans in the relatively new National Park.
When the lakes and clay pans dry up in summer, the eggs are left behind to wait for the next rainy season.