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；
It is condensed section with shells, downlap surface and ravinement surface that constitute the critical boundaries in dividing the system tracts of Matuo Formation.
含有介壳的凝缩段、下超面及沟蚀面是划分玛托组体系域的关键界面。
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