We found one dictionary that defines the word argillaceous rocks:

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1. argillaceous rocks: Vocabulary.com

(Note: See argillaceous_rock as well.)

Definitions from WordNet (argillaceous rock) ▸ noun:  a sedimentary rock formed from clay deposits ▸ Also see argillaceous_rock Types: shale, claystone, mudstone, slate, argillite, more... ▸ Words similar to argillaceous rocks ▸ Usage examples for argillaceous rocks ▸ Idioms related to argillaceous rocks ▸ Wikipedia articles (New!) ▸ Words that often appear near argillaceous rocks ▸ Rhymes of argillaceous rocks ▸ Invented words related to argillaceous rocks