一种地质现象，发生在古盆地边缘海侵程序中新老两个地层之间。 由于地壳运动的幅度、速度和方向的变化，沉积区的范围和位置会发生变化，造成盆地边缘区特殊的沉积接触关系。当新的沉积物的展布范围超过早先的盆地边界而覆盖在下伏地层或原为剥蚀区的基底上，使下伏地层产生尖灭现象，称作超覆。
海侵超覆 [地质] transgressive overlap ; transgressive overlapping ; onlap
地层超覆 stratigraphic overlap ; strata overlap ; overlap
海退超覆 [地质] regressive overlap
区域性超覆 regional overstep ; regional overlap
全超覆 complete overstep
替换超覆 replacing overlap
超覆封闭 overlap seals
超覆岩层 overlying measures
沉积超覆 sedimentary overlap ; sedimentary onlap
顶部超覆是无沉积作用间断的证据。
泡沫剂可以减缓气驱中的气窜和重力超覆现象。
Foam can retard gas channeling and gravity override in gas flooding.
证实郎山组与下伏地层之间存在一大型海侵超覆界面；
There exists a large-scale transgressive onlap boundary between the Langshan Formation and its underlying strata.
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