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Tricky to wash gravel through subsoil layer
Answer for the clue "Tricky to wash gravel through subsoil layer ", 7 letters:
hardpan
Alternative clues for the word hardpan
Word definitions for hardpan in dictionaries
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Hardpan \Hard"pan`\ (h[aum]rd"p[a^]n), n. The hard substratum. Same as Hard pan , under Hard , a.
Wiktionary
Word definitions in Wiktionary
n. 1 A distinct layer of soil that is largely impervious to water. 2 A dry lake.
Wikipedia
Word definitions in Wikipedia
For the geography term, a dry terminus of an internally drained basin in a dry climate (i.e. salt flat/playa), see Dry lake . In soil science , agriculture and gardening , hardpan or ouklip is a dense layer of soil , usually found below the uppermost topsoil ...
Usage examples of hardpan.
He raised the light, flashing the beam across the round, smooth terraces of what had been superheated mud pits, now cooled to dance floors of garishly colored hardpan still ringed with the traces of final bubbles--and there they were.