adv. [UN-1 11.] Geol. In an unconformable manner or position.
1839. Murchison, Silur. Syst., I. xxxiv. 451. In the former district, it has just been shown to be unconformably upon the coal measures and more ancient strata.
1875. J. W. Dawson, Dawn of Life, ii. 9. The crumpled … strata … are seen to underlie unconformably.
