Redclay

red clay

noun Geology.
a brown to red, widely distributed deep-sea deposit consisting chiefly of microscopic particles and tinted red by iron oxides and manganese.

Origin:
1350–1400; Middle English

red-clay, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
red clay

noun
clay whose redness results from iron oxide 
WordNet® 3.0, © 2006 by Princeton University.
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