学科：地史学、地层学 词目：底超 英文：baselap 释文：底超是指地层向其底界面作侧向终止，分为上超和下超两种。
到底超音速应该留下谁，把谁交易出去？
Windows 7将会在2011年底超越XP。
沙河街组底超、顶剥、中间相变明显，易形成多个层系、多种类型非构造圈闭。
Basal overlapping, top denudation, and facies variation between them are evident in Shahejie Formation, thus multiple layer systems and various types of non-structural traps can be formed.
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