understratum Definition

illuviation, stratum, superstratum, planosol, underclay, regosol, solonetz, desert soil, sloam, geosynclinal, soil, solonchak, interstratification, geoscopy, plutonism, atterrate, rendzina, remblai, subsoil, stylolite, isobathytherm, atterration, topsoiling, geanticlinal, geological process, fahlband, subsurface, bemoil, mycoderma, ablaqueation, wormcast, epeirogenesis, biostrome, chresard, alluvial fan, illutation, podzol, ablaqueate, earth pillar, geogonic, eluviation, peperino, foralite, natural depression, layer, illuvium, diaclasis, horizontal surface, grike, bedrock, decrustation, hydrospace, tilestone, peloid, floatstone, downthrow, gleization, humicubation, stromatology, calcivorous, terraculture, subcarboniferous, geogony, penecontemporaneous, plutonist, thermobarometer, vinquish, ionopause, podsol, neuston, sediment, ornithichnite, lithosol, surface, earthboard, geognosy, geological phenomenon, deterration, pedality, solar constant, ulmin, psammite, bathybius, diastrophism, anglemeter, antichthon, tanite, killow, humifuse, bergmeal, geocarpy, lithosphere, relief map, epigene, bradyseism, slickenside, nitrocalcite, growan, stratography, scolithus,