onlap
n. 上复层，超复
例句
On the seismic section it appears as erosion, toplap, onlap, downlap;
在地震剖面上表现为剥蚀、顶超、上超、下超；
Stratigraphy traps can be classified into stratigraphic onlap trap and stratigraphic erosion unconformity trap.
地层圈闭可分为地层超覆不整合圈闭和地层削蚀不整合圈闭。
There exists a large-scale transgressive onlap boundary between the Langshan Formation and its underlying strata.
证实郎山组与下伏地层之间存在一大型海侵超覆界面；
