argillaceous
American Heritage Dictionary:
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ar·gil·la·ceous
(är'jə-lā'shəs) 
adj.
Containing, made of, or resembling clay; clayey.
adj.
Containing, made of, or resembling clay; clayey.
[From Latin argillāceus : argilla, argil; see argil + -āceus, -aceous.]
Oxford Dictionary of Geography:
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argillaceous
Clay-like in composition and texture, referring to rocks containing clay minerals and clay-sized particles, for example, shale.
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Composed primarily of clay or shale; clayey.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Oxford Dictionary of Geography
A Dictionary of Geography. Copyright © Susan Mayhew 1992, 1997, 2004. All rights reserved.
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