峡谷以高壁悬崖为界，而且极有可能是断层，用来分隔突岩沟壑的地貌形态和相对平滑的部分。
The Chasma is bordered by high-walled cliffs, most likely faults, that show spur-and-gully morphology and smooth sections.
一种两侧以倾向相对的正断层为界的相对低位的断块。
A relatively low-standing fault block bounded by opposing normal faults.
下古生界的勘探区带评价的关键性指标首先是存在有效盖层，然后考虑张性断层对局部封盖条件的破坏作用。
The existence of effective cap rock is the key index of performing play evaluation on Palaeozoic prospecting, then to consider that tensional fault destroyed the cap rock in limited region.
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