calcareoargillaceous

== English == === Etymology === From calcareo- +‎ argillaceous. === Adjective === calcareoargillaceous (not comparable) (geology) Consisting of, or containing, chalk and clay. === References === “calcareo-argillaceous”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.