toplap
n. 顶超
例句
Toplap is evidence of a non de-positional hiatus.
顶部超覆是无沉积作用间断的证据。
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；
