discordant unconformity 基本例句 不整合 There is sufficient sand available to blanket the unconformity.这里有充足的砂质物铺盖不整合面。 The erosional surface dissected by such valleys may subsequently become an unconformity in the stratigraphic sequence.被这种河谷切割的侵蚀面后来可能成为地层层序中的不整合性。