argillaceous

argillaceous

[ahr-juh-ley-shuhs]
adjective
1.
Geology, Petrology. of the nature of or resembling clay; clayey.
2.
containing a considerable amount of clayey matter.

Origin:
1725–35; < Latin argillāceus clayish. See argil, -aceous

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World English Dictionary
argillaceous (ˌɑːdʒɪˈleɪʃəs)
 
adj
arenaceous Compare rudaceous (of sedimentary rocks and deposits) composed of very fine-grained material, such as clay, shale, etc

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