argillaceous

[ahr-juh-ley-shuhs]

ar·gil·la·ceous

[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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Argillaceous is always a great word to know.
So is infiltration. Does it mean:
thin, distinctive stratum useful for stratigraphic correlation
seepage of water into soil or rock
Collins
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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