comb. f. ARGILLOUS, as in argillo-calcareous a., calcareous with an admixture of clay; argillo-calcite, a clayey limestone.
1802. Howard, in Phil. Trans., XCII. 173. The Professor considers the stone … argillo-ferruginous.
1823. J. Badcock, Dom. Amusem., 183. Card-paper, covered with an argillo-calcareous mixture.
